TM 5-823-4
para 4-5
EACH PROPOSED LOCATION FOR A COMPASS-SWINGING ABASE MUST
BE CHECKED BY A MAGNETOMETER TO INSURE THAT THE AREA HAS
NEGLIGIBLE
MAGNETIC
CHARACTERISTICS
REGARDLESS
OF
ADHERENCE TO PARA 4-5.
Figure 6-1. Army airfield-heliport compass swinging base.
6-2