AD 52mm 12V 24V Digital GPS Speedometer TFT Screen | Trip ODO Mph Knot Km/h GPS Antenna For Motor Boat Car RV Speed Meter

Get accurate speed and distance data on your boat, car, or RV with this 52mm digital GPS speedometer. It uses a satellite signal to show your speed in mph, km/h, or knots, and tracks both trip and total mileage. The clear TFT screen and simple controls make it a practical upgrade for any dashboard.

This speedometer is built to handle the demands of life on the water or the road. The 52mm gauge fits into standard dashboard openings, and the waterproof design helps it stand up to splashes and weather. It connects easily to a 12V or 24V power system, making it versatile for different vehicles.

You can switch between speed units with a simple wire connection. The trip meter resets when you power down, while the odometer saves your total distance even after the power is off. A built-in digital compass adds extra navigation help. The package includes the speedometer and an optional gauge holder, so you can choose the setup that fits your needs.

Key Features and Benefits

- GPS satellite signal provides accurate speed and distance data without needing a mechanical connection

• TFT screen shows clear, easy-to-read numbers for speed, trip, and odometer readings

• Waterproof construction helps protect the gauge from moisture and weather during marine or outdoor use

• Switchable units let you read speed in mph, km/h, or knots with a simple wire contact

• Digital compass displays heading from 0 to 359 degrees for basic navigation assistance

• Memory function saves total odometer data even after power loss so you don't lose your records

Who Is This For

- Boat owners who need a reliable, waterproof GPS speed display for marine navigation

• Car and RV enthusiasts looking for a digital upgrade to a traditional analog speedometer

• Anyone replacing a broken or inaccurate speed gauge with a modern GPS-based solution

Usage Scenario

Mark took his fishing boat out on a large lake where the old mechanical speedometer had stopped working. He installed this 52mm GPS speedometer in the dash, connected the red wire to power and the black wire to ground, and had a clear digital speed readout in knots within seconds. The trip meter helped him track how far he traveled between fishing spots, and the compass gave him a quick heading reference when clouds hid the sun. After a full day on the water, the gauge was still working perfectly, with no fogging or moisture inside the lens.

Micro Comparison

Traditional mechanical speedometers rely on a pitot tube or cable drive that can clog, break, or wear out over time. This GPS speedometer uses satellite signals instead, so there are no moving parts to fail and no sensors to mount on the hull or wheel. It gives you accurate readings regardless of water conditions or tire size, making it a simpler and more reliable choice for many boats, cars, and RVs.

Specifications

- Gauge Size: 52mm / 2.05 in diameter

• Material: 316L stainless steel

• Power Input: 9-32 VDC (works with 12V and 24V systems)

• Tachometer Display Range: 0-999.9

• Total Odometer Range: 0-999999

• Trip Odometer Range: 0-999.9

• Digital Compass Range: 0-359 degrees

• Waterproof: Yes

• Weight: 500g / 17.6 oz

• Wiring: Black (Ground), Red (9-32 VDC Power), Yellow (Switch Unit)

Package Includes

- 1 x GPS Speedometer

• OR

• 1 x 52mm Gauge Holder (optional selection)

Why You Will Love It

You will love how easy it is to get accurate speed data without complicated installation or calibration. The waterproof build gives you peace of mind on the water, and the ability to switch between mph, km/h, and knots makes it useful whether you are driving on the highway or cruising on a lake. It is a simple, reliable tool that makes your dashboard more functional.

Questions and Answers

Question: Does this GPS speedometer work on a 12V boat battery?

Answer: Yes, it operates on any power input from 9 to 32 VDC, so it works with standard 12V and 24V systems found in boats, cars, and RVs.

Question: How do I switch between mph and km/h on this speedometer?

Answer: You briefly touch the yellow wire to the negative terminal (ground) to cycle through the available units: knots, mph, and km/h. The setting is saved automatically.

Question: Is the gauge waterproof for use on an open boat?

Answer: Yes, the speedometer is designed to be waterproof, making it suitable for marine environments where it may be exposed to splashes and rain.

Question: Does the odometer keep my total mileage after the power is turned off?

Answer: Yes, the total odometer (ODO) saves accumulated mileage data even after a power outage. Only the trip meter (TRIP) resets when power is disconnected.

Question: What size hole do I need to mount this gauge in my dashboard?

Answer: The gauge has a standard 52mm / 2.05 inch diameter body, so you will need a mounting hole of approximately 52mm. A gauge holder is available as an optional add-on.