5,Satisfied After-Sales Service.Fast Customer Service Response, Replacement or Refund if customer not satisfied. WARM TIPS: If you turn the compass quickly and continuously,it will takes a while for the compass ball to reposition the direction,please be patient,it will be done soon,if the direction error is large or completely wrong,please check whether there are magnets,metals,or electronic products around the compass,if there are,please remove them and test again. 4,Easy Mount Compass. Packaged with double-sided tape and screws, you Just need to fix it on the boat dashboard with the double-sided tape, then it is ready to use. 3,Magnetic Declination Adjustment. 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. 2,Night Lighting Compass. 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. 1,Boat Compass. The scale reading on the Red Indicator Line indicates your Forward Direction.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.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.

Special Feature: Portable. Item Dimensions LxWxH: 2.91 x 2.44 x 2.99 inches. Brand: DETUCK. Date First Available: July 31, 2019. Best Sellers Rank: #376,822 in Sports & Outdoors. Customer Reviews: 3.8 out of 5 stars 263 ratings 3.8 out of 5 stars. : B07W1NJQPH. Part Number: ?DK-LC550. Manufacturer: ?DETUCK. Brand Name: ?DETUCK. Item Dimensions LxWxH: ?2.91 x 2.44 x 2.99 inches. Package Weight: ?0.09 Kilograms. Item Package Dimensions L x W x H: ?3.7 x 3.3 x 2.7 inches.