Specification: - SOG: Speed over the ground - TRIP: Single mileage, reset after power failure - ODO: Accumulated mileage, save when power off - COG: heading, clockwise angle of true north - Battery voltage: 9~32V - Navigation pointer: 8 directions. - Can freely switch kont, mph, km/h speed unit GPS speedometer: 1 , Connect the device as picture E , the GPS speedometer will start to search GPS signal when power on. Generally, the GPS signal will be reached within 300 seconds, and the digital will display as counting (from 1 to 300) , also the words(GPS...) will be flickering as well , until the GPS signal was found, the sympol(GPS) will be lighting as normal. There will be an Error code "E02" if the GPS input was not be found within 300 seconds.Note: (1) Trip : Total mileage of a working cycle (data will be cleared after power off) (2) ODO: Total mileage of driving (data will be recorded) 2, Operation: a, Keep pressing the Mode button for 4 seconds to entry setting ODO data , the data will increasing as you keep pressing , also , the data will be decreasing if you release and press again. Data will be recorded if release for more than 3 seconds. b, Quick press the Mode button to switch the speed unit to Kmh / MPH / Knots3, 3Error code: E01: No GPS signal was found after start working E02: GPS signal was lost during working E03: Device failed Working environment: Working voltage: 9~32VDC Working current: