1Waterproof: The Gps speedometer is made of stainless steel 316L frame, well sealed, high strength, which is waterproof and dust proof. 2Antifogging: Adopting anti fog glass, Gps speedometer has great antifog effect, can be used in any weather condition, suitable for marine enviroment. 3Advantages: Working voltage of speedometer is Dc 9?32V, Tft screen, digital display. Gps has high accuracy and fast position confirmation. 4Multi Function: Gps speedometer has multi function display, such as single mileage, accumulated mileage, altitude, heading, longitude, latitude and speed. 5Universal Application: Speed meter is widely used in motorhomes, yachts, fishing boats, ships, motorcycles, automobile modification and other fields.