How to Read---- This is designed for car, boat or watercraft and the reading is totally opposite to normal . For example, when you are facing NORTH while the is placed in front of you, the reading shows "N" to you and "S" pointing north direction. The reading facing you is the correct direction that you are facing, that is "N". Good Reliability---- This for car is made of high-quality ABS material, which is wear-resistant and waterproof, so that it is very suitable for sea boats or marine vehicles. Professional manufacturing, high precision and good reliability. Wide Application---- This voyager bracket mount is designed for showing directions of autos, boats, caravan truck and so on. With compact size, this is very portable, and it is easy to use. Bottom Diameter: 6cm/2.36''. Size: 8 x 7.2cm/3.15'' x 2.83''. Adjustable Bracket---- The navigation has an adjustable mounting bracket, which can be installed on the dashboard to keep the at the correct angle of view to obtain accurate direction. High Accuracy---- This marine has built-in accuracy compensator to easily adjust for deviation, which makes the reading more precisely. Fast response, high sensibility, keep balance individually, precision engineering reading display.