Good, durable compass important in field. Use of a compass. To direct in a helicopter, give a back azimuth, ie, helicopter bearing to you. Compass typically used with a topographical map for navigation and position determination. Topographical Maps - Portray terrain features including elevation.
Contour lines represent constant elevation.
Every 5th line an index contour line. Closer contours are together, steeper terrain. Map border information - Adjacent maps, coordinate system info. Colors, shading, basic map symbols, and distance scale. Declination diagram - True North, Magnetic North, Grid North.