Dyno Racing GPS HUD Digital Display Gauge Speedometer,Speed,Driving Time,Mileage Accrual,Travel Distance,Accelerated time,Automatic Light Sensitive,Overspeed Alarm,Fatigue Driving Alarm USB Power
The G21 is a 5V-powered speedometer.Its primary function is to display the vehicle's current speed (in km/h or mph) via GPS.Additionally, it shows a variety of other information including total mileage, trip distance, driving time, acceleration time, altitude, compass direction, and time.
For initial setup and accurate function, the device must acquire GPS satellite signals.Upon first power-up, a flashing satellite icon indicates it is searching.A successful connection is confirmed when the display shows "00" instead of "- - -".
The device is configured through a comprehensive settings menu accessed and navigated using a combination of short/long presses and left/right turns of a central dial.Key adjustable parameters include speed calibration, three-level overspeed alarms, fatigue driving reminders, display brightness, speed/altitude units, time zone, and total mileage.
The display features several icons for important alerts: a flashing/fixed satellite icon for GPS status, an overspeed alarm icon, and a fatigue driving reminder icon.It also includes ambient and decorative lighting.
The manual addresses typical user problems.These include ensuring a proper 5V power connection, waiting for GPS signal acquisition in open areas, speed inaccuracy (requiring manual calibration in settings), and directional display errors which resolve once the vehicle speed exceeds 5 km/h.