Start by taking a bearing as normal using your map, then, holding the compass fixed against your hips, turn your body until the red end of the compass needle points to 10° on the ‘W.decl.’ scale.

This is why basic compass and map skills are so important. "Using a map with a compass is a skill that a lot of most people probably don't possess anymore," Bieri said.

Pennsylvania Army National Guard soldier shoots an azimuth using a lensatic compass during a land navigation event April 23, 2022 at Fort Indiantown Gap, Pa. (U.S. Army National Guard photo by ...