1. The pointing direction of the is same with the way forward of the vehicles2. Built in accuracy compensator. Read dials precisely and keep balance individually3. It can the car or boat very convenient4. Waterproof, fit for car, watercraft, boat, caravan and truck5. Fit for car, watercraft, boat, caravan and truck.Spec:Description: This voyager is designed for showing directions of autos, boats, caravan truck and so on. Because of its mountable and portable advantages, it is very convenient to be installed on the car or boat. Furthermore, the can keep balance individually and read dials precisely. Come on, this is worth buying!Features:1. The pointing direction of the is same with the way forward of the vehicles.2. Built in accuracy compensator. Read dials precisely and keep balance individually.3. It can the car or boat very convenient. 4. Waterproof, 5. Fit for car, watercraft, boat, caravan and truck.Specifications:Main Body Material: ABS Color: Black Size: 5.7 x 5.7 x 5.8cm / 2.24 x 2.24 x 2.28 Package Weight: 65g Fitment: For Watercraft, Boat, Caravan and TruckPackage Included: 1 x 1 x Magnetic Declination Adjustment Plectrum 1 x Gummed Paper 2 x Screws 1 x Manual BookNote: Please allow 1-3cm error due to manual measurement. Thanks for your understanding.1. Taking into account the convenience of the driver's observation and habits, this product deliberately reverses the magnetic steel of the product, and the points in the forward direction of the car (the direction of the is opposite to that of the conventional products, just read the pointer of the product watch core. scale shown); 2. The balls from the factory are all accurate balls in the opposite direction, and do not need to be adjusted. Only when there is a magnetic field influence when installed on a vehicle or boat,