1. Introduction
The G21 HUD (Head-Up Display) GPS Car Digital Speedometer is an advanced automotive accessory designed to enhance driving safety by projecting essential driving data directly into the driver's line of sight. Utilizing GPS technology, it accurately displays speed for all vehicle types, along with other crucial information such as time, mileage, altitude, and compass direction. Its compact design ensures it can be placed without obstructing the driver's view, and features like automatic brightness adjustment and overspeed alarms contribute to a safer and more informed driving experience.
2. Key Features
- GPS Speed Display: Accurately displays speed for all vehicle types (cars, trucks, motorcycles) using GPS technology.
- Compact Size: Dimensions of 83*56*18mm allow for flexible placement without obstructing driving view.
- Automatic Speed Notice: Equipped with a preset maximum speed setting; the device blinks automatically when the limit is exceeded.
- Built-in Light Sensor: Automatically adjusts display brightness based on external environment for optimal visibility.
- Convenient Power Supply: Powers via vehicle's Type-C port or car socket, with automatic on/off functionality synchronized with the car.
- Multiple Installation Methods: Can be installed on the dashboard with anti-slip tape or on the windshield with a suction cup bracket.
- Multi-functional Display: Shows Speed, Time, Traveling time, Mileage accrual, Travel distance, Altitude, Accelerated time, Compass, Number of satellites, Speed unit (MPH/KM/H), Overspeed alarm, and Fatigue driving alarm.
3. Package Contents
Please check the package to ensure all items are present and in good condition:
- 1x G21 GPS HUD Unit
- 1x Suction Cup Bracket
- 1x Type-C Power Supply Cable
- 1x Instruction Manual (this document)
- 1x Anti-slip Mat
4. Specifications
| Attribute | Value |
|---|---|
| Part Name | Car HUD Head-up display |
| Model | G21 |
| Material | ABS+PC |
| Size | Approx. 83 x 56 x 18 mm (3.28 x 2.2 x 0.72 inches) |
| Color | Black |
| Resolution | HD |
| Input Signal | GPS |
| Speed Unit | MPH, KM/H |
| Universality Fitment | Yes (Suitable for all models) |
| Voltage | Type-C 5V |
5. Setup and Installation
The G21 HUD offers flexible installation options to suit your preference and vehicle interior.
5.1 Placement Options
- Dashboard Installation: Place the G21 HUD on your car's dashboard using the provided anti-slip mat. Ensure it is positioned where it does not obstruct your view of the road or vehicle controls.
- Windshield Installation: Attach the G21 HUD to your windshield using the rotary suction cup bracket. The bracket allows for 360° rotation to achieve the optimal viewing angle.
5.2 Power Connection
Connect the G21 HUD to your vehicle's power source using the provided Type-C power supply cable. Plug the Type-C end into the HUD's high-speed Type-C interface and the other end into a suitable car socket (e.g., USB port or cigarette lighter adapter). The device is designed to automatically turn on and off with your car's ignition.
6. Operating Instructions
The G21 HUD provides a clear and comprehensive display of various driving parameters. Familiarize yourself with the display functions and controls for optimal use.
6.1 Display Functions Overview
The display is divided into several areas:
- Speed Display Area: Shows current driving speed in MPH or KM/H.
- Multi-function Display Area: Can show Altitude, Distance traveled, Travel time, Time, Total mileage, or Accelerated time.
- Compass: Indicates driving direction (N, S, E, W).
- Satellite Icon: Indicates GPS signal status.
- Fatigued Driving Icons: Alerts for prolonged driving.
- Speed Alarm Icon: Activates when preset speed limit is exceeded.
- Speed Unit: Toggles between MPH and KM/H.
- Ambient Lighting: Provides subtle illumination.
6.2 Controls and Settings
The G21 HUD features multi-function dial keys (located on the back/side, as shown in the dimensions diagram) for navigating settings and adjusting parameters. Specific instructions for changing settings (e.g., speed unit, alarm thresholds) will be detailed in the included printed manual. The built-in automatic sensor adjusts display brightness for optimal visibility in varying light conditions.
7. Maintenance
To ensure the longevity and optimal performance of your G21 HUD, follow these simple maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the display and exterior. Avoid using abrasive cleaners or solvents, which can damage the device.
- Storage: When not in use for extended periods, store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Cable Care: Handle the Type-C power cable gently. Avoid bending or crimping it excessively to prevent internal damage.
8. Troubleshooting
If you encounter issues with your G21 HUD, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | No power connection or faulty cable. | Ensure the Type-C cable is securely connected to both the HUD and the car's power source. Check if the car socket is functional. |
| No speed display / GPS signal lost | Poor GPS signal reception. | Ensure the device has a clear view of the sky. Move the vehicle to an open area away from tall buildings or tunnels. Wait for the satellite icon to stabilize. |
| Display is too dim or too bright | Automatic light sensor adjustment. | The device adjusts brightness automatically. If manual adjustment is desired, refer to the detailed instructions in the included printed manual for using the multi-function dial keys. |
| Inaccurate speed reading | Initial GPS calibration or interference. | Allow a few minutes for the GPS to acquire a stable signal. Ensure no large metallic objects are directly above the device. |
9. Warranty and Support
For specific warranty information, please refer to the documentation provided at the time of purchase or contact your retailer. General support for product inquiries and technical assistance can be obtained through the seller or manufacturer's customer service channels.