Smartwatch with tracking capabilities and methods for locating it

Abstract

Locatable Smartwatch and Methods for Locating It. The invention relates to a locatable smartwatch and methods for locating the watch. The watch comprises a strap 1 for attaching the watch to a user's wrist, a screen 3 for displaying time information, a case 2 attached to the strap 1 and containing an electronic circuit 5 and an electrical energy storage means 4. The electronic circuit 5 includes an antenna and is configured to transmit an electromagnetic signal representing identification information for the watch. At least a portion of the case 2 covering the antenna is made of a material transparent to the electromagnetic signal. Figure 1

Description

Title of the invention: Locatable smartwatch and methods for locating it. Technical field

[0001] The present invention relates to a connected watch, and methods for locating said watch. Previous art

[0002] Smartwatches are devices known for telling the time to a user. Smartwatches may also offer various features allowing a user to make phone calls, check email, or browse the internet. Smartwatches are also called "smartwatches." Such a watch is generally equipped with a screen to display information to the user.

[0003] There is a need for means of easily finding a smartwatch when it is lost. Description of the invention

[0004] An object of the present invention is to provide means to easily find a smartwatch when it is lost.

[0005] To this end, the invention proposes a connected watch comprising: • a bracelet to attach the watch to a user's wrist, • a screen to display time information, • a case attached to the bracelet and containing: • a means of storing electrical energy, • an electronic circuit powered by means of electrical energy storage.

[0006] The electronic circuit of the watch includes an antenna and is configured to transmit an electromagnetic signal representing information identifying the watch. At least a portion of the casing covering the antenna is transparent to the electromagnetic signal.

[0007] Thanks to the electronic circuit and the antenna, as well as the portion of the case transparent to the electromagnetic signal, the watch can emit a signal allowing its presence to be detected and thus to be located.

[0008] The watch according to the invention comprises a screen, such as a liquid crystal display or AMOLED screen, for displaying data to a user. The screen displays at least one time information, such as the time in digital format by displaying numbers. on the screen or in analog format by displaying hands on the screen. The screen forms part of the external surface of the watch, just like the case.

[0009] The watch includes a strap for attaching to the wrist of an adult or a child. It is therefore a wristwatch.

[0010] The electrical energy storage means comprises at least one battery or a cell such as a button cell. The electrical energy storage means is preferably a rechargeable battery. The electrical energy storage means is configured to supply electrical energy to the electronic circuit including the antenna. The energy stored in the electrical energy storage means provides the energy required by the electronic circuit and the antenna to transmit the electromagnetic signal, including generating and emitting the electromagnetic signal.

[0011] Preferably, the electrical energy storage means is further configured to supply electrical energy to the screen and / or other possible internal electronic circuits (preferably all such circuits) of the watch, for example, a microcomputer in the watch. Advantageously, the electronic circuit including the antenna is thus directly connected to the watch's primary power source, resulting in an efficient and compact watch without requiring additional space for this electronic circuit and a separate power source. For example, the watch measures 37 mm or less by 42 mm or less, and is 11 mm or less high, thus defining limited dimensions for a smartwatch incorporating so many technologies.

[0012] The portion of the housing covering the antenna can be made of one or more materials transparent to the electromagnetic signal.

[0013] For example, the portion of the watch case is made of one or more materials transparent to UHF (ultra high frequency) electromagnetic waves. Alternatively or concurrently, the portion of the case is made of one or more materials transparent to VHF (very high frequency) and / or SHF (super high frequency) waves.

[0014] Preferably, the entire case of the watch is transparent to UHF (ultra high frequency) electromagnetic waves. Alternatively or concurrently, the entire case is transparent to VHF (very high frequency) and / or SHF (super high frequency) waves.

[0015] The housing contains the electronic circuit and the antenna. Preferably, the housing is hermetically sealed, for example watertight and airtight.

[0016] In the context of this document, electromagnetic waves are designated according to the international standardization carried out by the International Telecommunication Union.

[0017] VHF waves or metric waves have a frequency between 30 MHz and 300 MHz.

[0018] UHF waves or decimetric waves have a frequency between 300 MHz and 3 GHz.

[0019] SHF waves or centimeter waves have a frequency between 3 GHz and 30 GHz.

[0020] The case may include the watch screen. In this case, the screen is part of the case. For example, the portion of the case described above includes part of the screen or is contained within the screen. For example, the case is enclosed by the watch screen.

[0021] The electronic circuit and antenna of the watch are configured to generate and emit the electromagnetic signal such that the electromagnetic signal is detectable by a first device separate from the watch. Preferably, the electromagnetic circuit and antenna are configured to emit the electromagnetic signal such that the electromagnetic signal is detectable by the first device at a distance in air of at least 10 m, preferably at least 25 m. This means that the electromagnetic signal is detectable by the first device when the watch is positioned within a radius of 10 m, preferably 25 m, of the first device, and that no obstacle other than air separates the first device from the watch. Since the first device is configured to receive the electromagnetic signal, it can detect the presence of the watch. For example, the first device is a smartphone.

[0022] In a preferred embodiment of the invention, the electronic circuit comprising the watch's antenna is configured to emit the ultra-high frequency (UHF) electromagnetic signal, preferably at a frequency between 2400 and 2483.5 MHz. This enables communication using the Bluetooth standard. Bluetooth technology has the advantage of allowing short-range communication with high energy efficiency between the watch and the first device.

[0023] In a preferred embodiment of the invention, possibly combinable with that of the preceding paragraph, the electronic circuit is configured to emit the ultra-wideband (UWB) electromagnetic signal, preferably at frequencies between 3100 and 10600 MHz, and more preferably between 6000 and 8500 MHz. The use of ultra-wideband signals allows for very precise localization. of the watch by the first device when a short distance separates the watch from the first device.

[0024] Preferably, at least one face of the antenna is oriented towards the portion of the housing covering the antenna and is not separated from the housing by an electromagnetic shielding piece capable of attenuating the electromagnetic signal. This avoids attenuation of the electromagnetic signal by the housing and therefore improves the energy efficiency of the watch for transmitting a signal at a given power.

[0025] Preferably, at least one face of the antenna directly faces the housing. This means that at least one face of the antenna is oriented towards the portion of the housing. For example, at least one face of the antenna directly faces the portion of the housing covering the antenna that is transparent to the electromagnetic signal. Preferably, there is no part separating the face of the antenna from said portion of the housing. This improves the efficiency of the electromagnetic signal transmission by the antenna.

[0026] Preferably, the watch case includes an on / off button for the electronic circuit to start or stop the transmission of the electromagnetic signal by the electronic circuit. This saves energy by switching off the electronic circuit when the watch is not in use or is not at risk of being lost.

[0027] In the context of this document, the transmission of the electromagnetic signal includes the generation and emission of the electromagnetic signal. The electromagnetic signal is generated by the electronic circuit and emitted by the antenna.

[0028] The button is configured to be pressed by a user. In response to successive presses of the button by a user, the electronic circuit is configured to transmit or stop transmitting, successively, the electromagnetic signal.

[0029] Preferably, the watch case is made of a polymer transparent to electromagnetic waves, such as plastic. In one example, the watch case is entirely transparent to electromagnetic waves and / or made entirely of polymer.

[0030] Preferably, the housing is made of an electrically insulating material.

[0031] The antenna can have a planar shape, that is to say, it has a shape flat. In other words, it is contained within a plane or flattened.

[0032] Preferably, the watch according to the invention also includes a microcomputer configured to display information on the watch screen. For example, this information could include weather information, telephone contacts, emergency contact numbers, battery charge status, calendar entries, or music being played by the watch. Preferably, the watch is configured to allow interaction between the user and the watch, so that the user can navigate menus or play games on the watch, for example.

[0033] Preferably, the watch according to the invention is further equipped with means for communicating via a mobile phone network and / or via Wi-Fi. This allows, in particular, data to be downloaded from the internet to the watch. Preferably, the watch's microcomputer is configured to receive this data.

[0034] The present invention also provides methods for locating a watch according to the invention. Preferably, these methods are implemented by computer.

[0035] In a first embodiment of a method according to the invention, the method comprises: • wireless transmission of an electromagnetic signal representing watch identification information by an electronic circuit located in the watch and including an antenna, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a relative position of the watch with respect to the first device and display of the relative position of the watch on a screen of the first device.

[0036] For example, the first device is a smartphone.

[0037] Preferably, the electromagnetic signal emitted by the antenna is ultra-wideband (UWB), and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz, preferably between 6500 and 8000 MHz. This allows for precise localization of the watch.

[0038] In the methods according to the invention, the determination of the watch's position by the first device and the display of the watch's position determined by the first device are performed in response to the reception of the electromagnetic signal by the first device. The electromagnetic signal received by the first device includes the wristwatch identification information.

[0039] In a second embodiment of a method according to the invention, the method comprises: • wireless transmission of an electromagnetic signal representing watch identification information by an electronic circuit located in the watch and including an antenna, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a position of the first device and transmission to a second device of a second signal representing the watch's identification information and the position of the first device, • reception of the second signal by the second device and display of the position of the first device on a screen of the second device.

[0040] The second device is distinct from the watch and from at least one other device. For example, the second device is a smartphone. For example, the second device belongs to an owner of the watch.

[0041] For example, the determination of the position of the first device is carried out by means of a geolocation circuit of the first device.

[0042] The transmission, by the first device, of the second signal to the second device can be carried out via a wireless communication network, and optionally via a server.

[0043] The second signal is preferably electromagnetic.

[0044] This method has the advantage of working even when the first device cannot precisely determine the watch's position, which can occur when the watch is too far from the first device. For example, this is the case when the watch is at a distance from the first device that exceeds the maximum transmission range of the ultra-wideband electromagnetic signal. In this case, the watch can be configured to transmit the electromagnetic signal according to the Bluetooth standard to the first device. This results in a less precise location of the watch, but one that can still be achieved when the first device is at a greater distance from the watch.

[0045] The first device then detects the presence of the watch within a certain perimeter around the first device, but without being able to precisely determine its relative position with respect to the first device. Next, the first device sends its own location to a second device, which provides the second device with an approximation of the watch's position.

[0046] Preferably, the electromagnetic signal is received simultaneously or at different times by several distinct first devices of the watch. In this way, it is possible to use a large number of first devices to locate the watch, even when it is moved. For example, the first devices are smartphones, carried by users distinct from the users of the watch and the second device, and connected to the second device, for example, via a telecommunications network and a server.

[0047] The second device is configured to receive the second signal representing the watch's identification information and the position of the first device. The second signal is preferably wireless. Based on the second signal, the second The device is configured to display the position of the first device, which is an approximate position of the watch.

[0048] This allows a user of the second device to benefit from the proximity between the first devices and the watch to locate the watch, the first devices being, for example, worn by different people. The user of the second device then does not need to be near the watch to detect it, nor does he need to contact users of the first devices to locate the watch.

[0049] For example, the first device is a smartphone. Preferably, the electromagnetic signal is received by several first devices. In this case, the position of the watch can be determined by triangulation, for example, which is more precise.

[0050] Preferably, the second signal is transmitted to the second device via a server comprising a database that maps the watch's identification information to an identification information of the second device. In this case, the method comprises: • in response to the server receiving the second signal, and using the server: determination of the second device based on the watch's identification information and the database, • transmission by the server of the watch identification information and the position of the first device to the second device determined by the server.

[0051] The signal transmitted by the server can be the second signal, possibly modified, or another signal representing the identification information of the watch as well as the position of the first device.

[0052] The electromagnetic signal emitted by the antenna is preferably ultra-high frequency (UHF), preferably at a frequency between 2400 and 2483.5 MHz.

[0053] In a third embodiment of a method according to the invention, the method comprises: • wireless transmission of an electromagnetic signal representing watch identification information by an antenna located in a watch case, • reception of the electromagnetic signal by a first device separate from the watch, • In response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a position of the watch and transmission of a second signal to a second device representing the watch's identification information as well as the watch's determined position, • reception of the second signal by the second device and display of the watch's position on a screen of the second device.

[0054] The determination of a position of the watch by the first device may include a determination of a relative position of the watch with respect to the first device combined with a determination of a position of the first device.

[0055] The second device is distinct from the watch and from at least one other device. For example, the second device is a smartphone. For example, the second device belongs to an owner of the watch.

[0056] In one example, the second device is configured to allow the second device to display the watch's position, while the first device is configured to prevent the first device from displaying the watch's position. This avoids providing the watch's position to users of the first devices if they are not the watch's owners or are not authorized to access the watch's location.

[0057] For example, the determination of the position of the first device is carried out by means of a geolocation circuit of the first device.

[0058] The wireless transmission of the second signal to the second device can be wireless, for example via a wireless communication network optionally including a server. Optionally, the server is configured to determine the position of the watch based on the relative position of the watch with respect to the first device and the position of the first device.

[0059] Preferably, the method is implemented using several first devices. Optionally, the server is configured to determine the watch's position based on the relative positions of the watch with respect to the first devices and the position of the first devices themselves. Using several first devices allows for a more precise determination of the watch's position.

[0060] The method has the advantage of allowing precise localization of the watch. In the method, the watch can be configured to transmit the ultra-wideband electromagnetic signal to the first device. Preferably, the electromagnetic signal emitted by the electronic circuit is ultra-wideband (UWB), and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz.

[0061] The first device determines the relative position of the watch with respect to the first device. The first device also determines the position of the first device, for example by geolocation. Based on the position of the first device and the relative position of the watch thus determined, it is possible to determine the position of the watch. This determination of the watch's position based on the position of the first device and the relative position of the watch can be done by the first device, by the second device, or even by a separate server.

[0062] Based on the position of the first device and the relative position of the watch thus determined, the first device generates and transmits the second signal to the second device.

[0063] The second signal is preferably electromagnetic.

[0064] The second device then displays the position of the watch, which allows a user of the second device to find the watch.

[0065] Preferably, the electromagnetic signal is received simultaneously or at different times by several first devices distinct from the watch. In this way, it is possible to use a large number of first devices to locate the watch, even when it is moved. For example, the devices are smartphones, possibly carried by users distinct from the users of the watch and the second device, and connected to the second device.

[0066] The second device is configured to receive the second signal transmitted by at least one first device. The second signal therefore includes the watch's identification information and the watch's position. Based on the second signal, the second device is configured to display the watch's position.

[0067] This allows a user of the second device to benefit from the proximity between the first devices and the watch to locate the watch, the first devices being, for example, worn by different people. The user of the second device then does not need to be near the watch to detect it, nor does he need to contact users of the first devices to locate the watch.

[0068] For example, the first device is a smartphone. Preferably, the electromagnetic signal is received by several first devices which, in response to receiving the electromagnetic signal, each determine a position of the watch and each transmit a respective second signal representing the watch's identification information as well as the watch's position. In this case, the transmission is preferably carried out via a server which receives all the second signals, determines the watch's position based on the second signals, and transmits the position and the watch's identification information to the second device.

[0069] Preferably, the second signal is transmitted to the second device via a server comprising a database matching the identification information from the watch and identification information from the second device. In this case, the method includes: • in response to the server receiving the second signal, and using the server: determination of the second device based on the watch's identification information and the database, • transmission by the server of the watch identification information and the watch's position to the second device determined by the server.

[0070] The signal transmitted by the server can be the second signal, possibly modified, or another signal representing the watch's identification information and the watch's position.

[0071] In the context of this document, the terms 'locate' and 'localization' are used interchangeably with the terms 'determine a position' and 'position'.

[0072] Within the scope of this document, position information for a device such as the watch or the first device may, for example, include geographical coordinates of the device.

[0073] The use, in this document, of the verb "comprendre" (to understand), its variants, and its conjugations, cannot in any way exclude the presence of elements other than those mentioned. The use, in this document, of the indefinite article "un" (a), "une" (an), or the definite article "le" (the), "la" (the), or "l'" (the), to introduce an element does not exclude the presence of a plurality of these elements.

[0074] All preferred embodiments, characteristics, and advantages of the embodiments of the method according to the invention are transposed mutatis mutandis to other embodiments of the method according to the invention and vice versa.

[0075] All preferred embodiments, characteristics, and advantages of the watch according to the invention are transposed mutatis mutandis to the methods according to the invention and vice versa. Brief description of the figures

[0076] Other features and advantages of the present invention will become apparent from the following detailed description, for the understanding of which reference will be made to the attached [Fig.1] illustrating an exploded schematic view of the components of a watch according to the invention.

[0077] The drawings in the figures are not necessarily to scale. Similar features are generally denoted by similar reference numerals in the figures. Within the scope of this document, identical or analogous features may bear the same reference numerals. In addition, the presence of reference numerals or letters to the drawings cannot be considered limiting, including when these numbers or letters are indicated in the claims.

[0078] Detailed description of embodiments of the invention

[0079] This section presents a detailed description of preferred embodiments of the present invention. The invention is described with particular embodiments and references to figures, but the invention is not limited by them. In particular, the drawings or figures described below are only schematic and are not limiting.

[0080] The terms "first", "second", "third", etc. are used in this document exclusively to differentiate different elements, without implying any order between these elements.

[0081] Fig. 1 illustrates components of a watch according to the invention, in exploded view. The watch comprises two parts of a strap 1, each part being attached to the case and including means for closing the strap around a user's wrist. The watch case 2 is enclosed by a display screen 3. The watch is configured to display the time on the screen, as well as other information such as weather forecasts, game information, or telephone contact information.

[0082] The watch includes an on / off button 6 for the electronic circuit 5 so that a user can activate or deactivate an emission of the electromagnetic signal by the antenna of the electronic circuit by successive presses of the button.

[0083] The housing 2 is made of non-conductive polymer, and can therefore allow the electromagnetic wave emitted by the antenna to pass through it without attenuating it. The housing 2 contains the electronic circuit 5 comprising the antenna, and the electrical energy storage means 4, which is a rechargeable battery.

[0084] The case 2 is closed by the screen when the watch is in the assembled configuration. In the assembled configuration, the case is water and airtight to protect the electronic circuit from moisture.

[0085] The antenna is electrically coupled to the electronic circuit.

[0086] When the electronic circuit is activated and the antenna emits the electromagnetic signal representing the watch's identification information, the watch can be part of a system enabling its geolocation and implementing a method according to the invention. The watch's position can thus be determined and communicated to a user.

[0087] For example, the electronic circuit including the antenna is configured to emit the ultra-wideband electromagnetic signal and / or according to the Bluetooth standard and which is detectable by a first device, such as a smartphone, located near the watch, for example within a radius of 10m or 50m from the watch. The electromagnetic signal represents information identifying the watch, that is to say, it allows identification of the watch that emitted the electromagnetic signal.

[0088] The smartphone is further configured to locate the watch in response to the reception of the electromagnetic signal, either by detecting that the watch is within a certain radius around it (following the reception of the Bluetooth signal), or by accurately calculating the relative position of the watch with respect to it (following the reception of the ultra-wideband signal).

[0089] The smartphone may belong to the watch owner or to third parties unknown to the watch owner. If the smartphone belongs to the watch owner, it may display the watch's relative position to the phone to allow the watch owner to locate it.

[0090] If the smartphone belongs to a third party, it can be configured not to display the watch's position and to send a second signal representing the watch's position information. For example, the position information could be: its own position, or the watch's position calculated based on its own position and the watch's relative position with respect to the smartphone (first device), or the watch's relative position with respect to the smartphone (first device) separate from the smartphone's position (first device). The third party's smartphone generates and transmits a second electromagnetic signal, which is then transmitted to a second device, such as another smartphone belonging, for example, to the watch's owner.The second electromagnetic signal represents the watch's position information as well as its identification information.

[0091] The second signal can be transmitted to the second device by the first device via a wireless telecommunications network comprising, for example, a server. The server is configured to determine, based on the watch's identification information, the second device to which to transmit the second signal, so that the watch's identification and position information is transmitted to a predetermined second device. For example, the server can perform this operation by means of a server database that maps the watch's identification information to identification information of the second device.

[0092] The watch owner's smartphone can then display the watch's location to allow the owner to find it. The advantage of this method is that, to find the watch, it is possible to use a large number of third-party telephones positioned near the watch to locate it, without the watch owner having to contact them.

[0093] In summary, the invention relates to a locatable smartwatch and methods for locating the watch. The watch includes a strap 1 for attaching the watch to a user's wrist, a screen 3 for displaying time information, a case 2 attached to the strap 1 and containing an electronic circuit 5 and an electrical energy storage means 4. The electronic circuit 5 includes an antenna and is configured to transmit an electromagnetic signal representing information identifying the watch. At least a portion of the case 2 covering the antenna is made of a material transparent to the electromagnetic signal.

[0094] It will be obvious to a person skilled in the art that the invention is not limited to the realizations and examples illustrated and / or described above, but that its scope is more broadly defined by the claims introduced below.

[0095] The present invention has been described above in relation to specific embodiments, which are purely illustrative and should not be considered limiting. It will be readily apparent to those skilled in the art that the invention is not limited to the examples illustrated or described above, and that its scope is more broadly defined by the claims introduced below.

Claims

Demands

1. A smartwatch comprising: • a strap (1) for attaching the watch to a user's wrist, • a screen (3) for displaying time information, • a case (2) attached to the strap (1) and containing: • an electrical energy storage means (4), • an electronic circuit (5) powered by the electrical energy storage means (4), characterized in that the electronic circuit (5) includes an antenna and is configured to transmit an electromagnetic signal representing watch identification information, and in that at least a portion of the case (2) covering the antenna is transparent to the electromagnetic signal.

2. Watch according to claim 1, wherein the electronic circuit (5) is configured to emit the ultra-high frequency (UHF) electromagnetic signal, preferably at a frequency between 2400 and 2483.5 MHz.

3. A watch according to any one of the preceding claims, wherein the electronic circuit (5) is configured to emit the ultra-wideband (UWB) electromagnetic signal, and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz.

4. Watch according to any one of the preceding claims, wherein at least one face of the antenna is oriented towards the portion of the housing covering the antenna and is not separated from the housing by an electromagnetic shielding piece capable of attenuating the electromagnetic signal.

5. Watch according to any one of the preceding claims, wherein the case (2) further includes an on / off button (6) for the electronic circuit (5) to start or stop the transmission of the electromagnetic signal by the electronic circuit (5).

6. Watch according to any one of the preceding claims, wherein the case (2) is made of electromagnetic wave transparent polymer.

7. Watch according to any one of the preceding claims, equipped with means to communicate via a mobile telephone network and / or via wifi.

8. Watch according to any one of the preceding claims, wherein the electrical energy storage means (4) is also configured to supply electrical energy to the display (3) and / or other internal electronic circuits of the watch.

9. A method for locating a watch according to any one of the preceding claims, comprising: • wireless transmission of an electromagnetic signal representing watch identification information by an electronic circuit (5) located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a relative position of the watch with respect to the first device and display of the relative position on a screen of the first device.

10. A method for locating a watch according to any one of claims 1 to 8, comprising: • wireless transmission of an electromagnetic signal representing watch identification information by an electronic circuit (5) located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a position of the first device and transmission to a second device of a second signal representing the watch identification information and the position of the first device, • reception of the second signal by the second device and display of the position of the first device on a screen of the second device.

11. Method according to the preceding claim, wherein the electromagnetic signal emitted by the electronic circuit (5) is ultra-high frequency (UHF), preferably at a frequency between 2400 and 2483.5 MHz.

12. A method for locating a watch according to any one of claims 1 to 8, comprising: • wireless transmission of an electromagnetic signal representing watch identification information by an electronic circuit (5) located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a position of the watch and transmission to a second device of a second signal representing the watch identification information and the position of the watch, • reception of the second signal by the second device and display of the position of the watch on a screen of the second device.

13. A method according to any one of claims 10 to 12, wherein the second signal is transmitted to the second device via a server comprising a database mapping the identification information of the watch and an identification information of the second device, and comprising: • in response to the reception of the second signal by the server, and by means of the server: determination of the second device based on the identification information of the watch and the database, • transmission by the server of the identification information of the watch and the position of the watch and / or of the first device to the second device determined by the server.

14. 17 Method according to any one of claims 9, 12, or 13 when it depends on claim 12, wherein the electromagnetic signal emitted by the electronic circuit (5) is ultra-wideband (UWB), and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz.

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