Skip to main content
U.S. flag

An official website of the United States government

How Should I Set My GPS and Compass?

<Back

Let’s assume the local declination is 10 degrees east of true north, and the waypoint you wish to navigate to is directly north of your current location.

If using a compass without adjustable declination, set your GPS to magnetic north. Your GPS will indicate a bearing of 350 degrees must be followed to reach the waypoint. Dial 350 degrees on your compass. With the direction-of-travel arrow pointed directly away from you, turn your body & compass in one motion until the red magnetic needle overlays the orienting arrow. Site a landmark along that bearing, and proceed. You will be traveling directly north toward the waypoint.

If using a compass with adjustable declination, set your GPS to true north. Your GPS will indicate a bearing of zero degrees must be followed to reach the waypoint. Adjust the declination on your compass so the orienting arrow points to 10 degrees east. Dial zero degrees on your compass. With the direction-of-travel arrow pointed directly away from you, turn your body & compass in one motion until the red magnetic needle overlays the orienting arrow. Site a landmark along that bearing, and proceed. You will be traveling directly north toward the waypoint.