At least one
antenna array including three mutually orthogonal antennas each sharing a common center point senses an
electromagnetic signal emitted by a buried object such as a utility line,
pipe or sonde. A circuit at least partially mounted in a housing is connected to the array and determines a location of the buried object by measuring
signal strength and field angles in three dimensions without having to align the
antenna array relative to the buried object while eliminating nulls and false peaks. A
graphical user interface (GUI) has user-friendly icons, symbols, menus, numbers and graphical and auditory representation of
signal strength. A SEARCH view indicates
signal strength by showing a rotating strength indicator, a trace mode MAP view in which line location is shown by a line that moves side-to-side, and a sonde mode MAP view in which sonde location is shown by a moving line, pole and
equator.