[GingisK]

Move 20 feet, and be accurate. (I know how it works)

[dhs12345]

Me too. Gotta move for the device to know which direction. Vector or two points sets direction. Better units include a compass for navigation and line of site nav while standing still. Been using them for a long time. Of course all of this is now integrated into your smart phone or car navigation system. You can definitely navigate without the compass. Not sure how it works when the compass is give false true north information.