Lessons in aiming for machine gunners (ground defense) gyroscope becomes a compass gyro compass, principles of the gyroscope (Geen titel) Bomb incendiary compass system Intermediate Acrobatics Part I, The loop Basic map reading Part 1, Conventional signs Basic map reading Part 2, Elevation, distance and grid Basic map reading Part 3, Direction, orientation and location with compass Basic map reading Part 4, Direction, orientation and location without compass Basic map reading Part 5, Photos and photomaps Use of problem in teaching