Docbraces GPS Speedometer G21 Heads Up Display User Manual

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your Docbraces GPS Speedometer G21 Heads Up Display (HUD). Please read this manual thoroughly before using the product to ensure proper function and safety.

2. Product Overview

The Docbraces GPS Speedometer G21 is a universal heads-up display designed to project essential driving data directly into your line of sight. It utilizes GPS and BDS dual-mode chip technology for accurate speed and directional information, compatible with all vehicles equipped with a USB port.

Image 2.1: Docbraces GPS Speedometer G21 Heads Up Display. This image shows the compact device with its suction cup mount, displaying speed and compass information.

2.1. Key Components

• Display Unit: Main unit showing speed, compass, and other data.
• USB Cable: For power connection.
• Suction Cup Mount: For dashboard or windshield installation.
• Anti-slip Pad: Alternative mounting option.

3. Features

• Digital GPS Speedometer Display: Real-time speed (MPH/KM/H) and direction.
• Enhanced Signal Reception: Dual-mode GPS + BDS chip with 10Hz refresh rate for precise positioning.
• Smart Auto-Brightness Adjustment: Adapts screen brightness to ambient light conditions.
• Dual Safety Alerts: Overspeed Alert and Fatigue Driving Reminder.
• Compass Function: Built-in vehicle compass for real-time directional data.
• ODO Function: Comprehensive mileage tracking (total distance and trip meter).
• Universal Compatibility: Plug and Play via USB port for all vehicles.
• Clearer Display: High-contrast, large-font readout with anti-glare technology.

Image 3.1: G21 Display Function Diagram. This diagram illustrates the various display areas and icons on the HUD, including speed, compass, satellite icon, fatigued driving icon, speed alarm icon, and multi-function display area.

4. Setup

4.1. Installation

1. Choose Placement: Select a suitable location on your dashboard or windshield that does not obstruct your view of the road.
2. Attach Mount: Secure the suction cup mount to the chosen surface. Ensure the surface is clean and dry for optimal adhesion. Alternatively, use the provided anti-slip pad for dashboard placement.
3. Position HUD: Attach the HUD unit to the mount. The mount allows for 360-degree rotation to adjust the viewing angle.
4. Connect Power: Plug the provided USB cable into the HUD unit's Type-C port and connect the other end to your vehicle's USB port or a USB car charger.

Image 4.1: Suction Cup Holder Rotation. This image demonstrates the 360-degree rotational capability of the suction cup mount for flexible positioning of the HUD.

4.2. Initial Power-On

Once connected, the HUD will automatically power on when the vehicle's ignition is turned on. It will begin searching for GPS signals. This process may take a few seconds. Ensure the device has a clear view of the sky for optimal signal acquisition.

5. Operating Instructions

5.1. Display Modes

The G21 HUD offers 6 customizable display modes. Use the multi-function dial keys (located on the back of the unit) to cycle through these modes:

• Speed: Displays current speed only.
• Time: Displays current time (satellite clock).
• Speed + Travel Time: Shows current speed and duration of the current trip.
• Speed + Distance Traveled + Ambient Lighting: Displays speed, trip distance, and indicates ambient light adjustment.
• Speed + Total Mileage + Compass + Ambient Lighting: Shows speed, total odometer reading, compass direction, and ambient light adjustment.
• Speed + Altitude + Compass + Ambient Lighting: Displays speed, current altitude, compass direction, and ambient light adjustment.

Image 5.1: Multiple Display Modes. This image shows six different display configurations available on the HUD, including speed, time, speed with travel time, speed with distance, speed with total mileage and compass, and speed with altitude and compass.

5.2. Unit Switching (MPH/KM/H)

The default speed unit is MPH. To switch between MPH and KM/H, refer to the detailed instructions in the included user manual for specific button presses on the multi-function dial keys.

5.3. Odometer Function (ODO)

The HUD tracks total mileage (ODO) which is automatically saved upon engine shutdown. A separate trip meter measures point-to-point journey distances and resets after each power cycle. The ODO can be manually set or reset via the menu options.

Image 5.2: ODO Total Mileage Tracking. This graphic illustrates how the HUD tracks total mileage (ODO) and retains single trip measurements, saving data even after the engine is turned off.

6. Safety Alerts

The G21 HUD includes two primary safety alert functions:

• Overspeed Alert: You can set a custom speed threshold (default: 120 km/h or 75 mph). If your vehicle exceeds this speed, the HUD will trigger an audible and/or visual alarm.
• Fatigue Driving Reminder: An alarm will automatically activate after 4 hours of continuous driving, reminding you to take a break.

These alerts are designed to enhance road safety and compliance. Settings for these alerts can be adjusted through the device's menu.

Image 6.1: Safety Alert Icons. This image displays the overspeed alarm and fatigue driving reminder icons on the HUD, indicating active safety features.

7. Maintenance

• Cleaning: Use a soft, dry cloth to clean the display and exterior of the unit. Avoid abrasive cleaners or solvents.
• Storage: If storing the device for an extended period, disconnect it from power and store it in a cool, dry place.
• Cable Care: Ensure the USB cable is not kinked or damaged.

8. Troubleshooting

9. Specifications

• Model: GPS Speedometer G21
• Brand: Docbraces
• Material: Acrylonitrile Butadiene Styrene (ABS)
• Product Dimensions: 3.27 x 2.2 x 0.7 inches
• Item Weight: 160 Grams (5.64 ounces)
• Connectivity: USB (Type-C)
• Positioning System: GPS + BDS Dual-mode
• Refresh Rate: 10Hz
• UPC: 768825881739

10. What's in the Box

• 1 x Docbraces GPS Speedometer G21 HUD
• 1 x USB Cable
• 1 x User Manual (this document)
• 1 x Anti-slip Pad
• 1 x Suction Cup Mount

Image 10.1: Package Contents. This image displays all items included in the product box: the G21 HUD unit, USB cable, user manual, anti-slip pad, and rotary suction cup mount.