Feature: 1. Function: Display longitude, latitude, miles, single mileage and accumulated mileage. With backlight, it is convenient to view by boat at night. 2. IP67 Waterproof: Stainless steel front cover bezel and anti fog curved glass cover, which can be used normally even in acid, alkali and humid environments. 3. Anti Fog Function: High transparency PC and curved glass structure form a double layer of anti fog, and the anti fog performance is much higher than that of single layer glass coating anti fog agent. 4. High Accuracy: The LCD screen is adopted, which is characterized by high accuracy, strong universality, reliability, stability, and ease of use. 5. Wide Working Voltage Design: Working voltage 9?32V, low power consumption, long life, short starting time It is very suitable for ships, fishing boats, yachts, outboard engines and other kinds of water vehicles. Specification: Item Type: GPS Speedometer Material: ABS, metal Installation Size: Approx. 52mm/2.05in Function: Display longitude, latitude, miles, single mileage and accumulated mileage Working Voltage: 9-32V Working Current: ? 100mA Operating Temperature: - 20 -+70 ? Storage Temperature: - 30 -+80 ? Display Mode: LCD Display Range Of Speedometer: 0-999.9 Total Mileage Display Range: 0-999999 Trip Mileage Display Range: 0-999.9 Applications: Used in motorhomes, yachts, fishing boats, ships, engineering machinery, agricultural machinery, modified vehicles, etc. How to Use: Open a hole with a diameter of 52mm on the instrument mounting plate Make sure there is at least 55mm space behind the instrument panel Wiring: 1. Black wire: power negative pole (?) 2. Red wire: 9?32VDC 3. Yellow line: switch speed unit Package List: 1 x Speedometer 1 x GPS 1 x Manual