This app converts your Android phone into a simple, clear HUD for your car displaying momentary velocity as measured by your GPS. Lodge it between the windshield and the dashboard. Usable mainly during the night. Occasionaly you may see these alerts: * OFF - location access is turned off * NFX - no fix (yet) * NAV - not available (GPS engine status) * LAG - GPS speed did not update since at least 2500 ms