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Boat Compass Marine Compass Precautions: 1,Kindly Remind: Please read the Red Indicator Line directly to know your forward direction, do not distinguish the directions from the top of the compass, because the direction of the marine compass is opposite to the direction of the ordinary compass, marine compass shows the direction you are going, not the direction of the geomagnetism. 2,Please adjust the compass on a horizontal level, make the compass can be can be free to rotate. 3,To make sure the compass work correctly, please make it stay away from other magnetic objects that may disturb it's function, such as: magnets, iron objects, metal objects, electrical appliances, mobile phones, watches, stereos, headphones, tapes, sound box, speakers, audio system etc. 4,Don't hit or beat the compass ,avoid liquid leakage, so as not to affect the compass accuracy. 5,Don't approach compass to high temperatures and avoid long time sun exposure. The scale reading on the Red Indicator Line indicates your forward direction.Please adjust the compass on a horizontal level, make the compass can be can be free to rotate.Please make it stay away from other magnetic objects that may disturb it's function. The wires use to connect an external 12V power supply to illuminate red light when night use, you can choose not to connect it if you only use it in day time, that depends on your need. There are two holes, which can adjust the magnetic declination in the east-west direction and the north-south direction. This function will improve the accuracy of the compass, it is special for someone more precise needs. Actually it does not require additional adjustment of the magnetic declination when daily life. Look at the Red Indicator Line, this means that your forward direction is southwest, and the scale reading is 250 degrees. The distance between every two small scales represents 5 degrees. Compass size: 2.91 * 2.44 * 2.99 inches , net weight: 2.771 ounce. Packaged with double-sided tape and screws, you Just need to fix it on the dashboard with the double-sided tape, then it is ready to use.