DETUCK Boat Compass Dashboard Marine Compass for Boat Compass Dash Mount Night Lighting

1,Boat Compass. The direction indicated by the letter pointed by the red indicator line is the direction in which the car is heading. 2,Night Lighting Compass. Need an external 12V power supply to illuminate red light, it can also be used at night.3,Magnetic declination adjustment. There are two holes, which can adjust the magnetic declination in the east-west direction and the north-south direction.4,Easy Mount Compass. Packaged with double-sided tape and screws, it can be easily installed where you want.