inputs.text: thirtysomething dollars pretty good - tested gps standard 400 track first lap gave reading 04 km second lap 08 km third lap 13 km 100 25 laps 10 km gps nearly 1 km bear mind track oval resolution gps might not good start stop points close together able distinguish 400 oval track quite accomplishment something cheap 3040 gps actually performs pretty wellthe comment gps kept motionless not walk around much trying track satellites not capable finding satellites walking running even slowly however stay still pick multiple satellites unlike gps meant cars cannot turn gps start moving let find satellites not locks onto satellites go wherever wantit suggested use instruction manual would user return one 16 stored locations also good way keep track distance moved not meant sophisticated navigation not compass