The G20 is a GPS speedometer designed for vehicles.It operates strictly on 5V DC power supplied via a USB connection.Modifying the installation wiring or using a voltage higher than 5V is prohibited.
Installation involves connecting the device to a car's USB port.Upon powering on, it must search for and acquire satellite signals, indicated by the display changing from '--' to '0'.The vehicle may need to be moved to an open area for initial signal acquisition.
The device displays vehicle speed (in km/h or mph), a compass direction (N, S, E, W), and features an ambient light (toggle by short press).In addition, this HUD is not just a speed display, head-up hud display has multiple functions including speed, compass, and speeding warnings
A settings menu (entered by a 2-second long press) allows adjustment of various parameters.Key settings include speed calibration (fine-tuning), three-stage speed alarm settings (e.g., 150, 180, 200 km/h), display brightness mode (auto or manual), speed unit selection (km/h or mph), and a factory reset option.
No power/screen (check/replace USB cable), no speed reading (ensure satellite signal is acquired), persistent speed display after stopping (caused by signal loss in areas like tunnels), speed inaccuracy (check unit and use speed fine-tuning), and incorrect compass direction (requires vehicle speed over 5 km/h to determine direction accurately).
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