магнітне відхилення
magnetic liquid compass / wet compass
grid variation
muzzle velocity variation
diurnal temperature variation
east variation
magnetic variation chart
pressure variation
magnetic variation / magnetic declination
variation chart
variation correction
variation
compass bearing
compass case
compass direction
compass error
compass heading
compass march
compass north
compass rose (wind rose)
gyromagnetic compass
lensatic compass
adjusted compass
compass data
compass of the base point
individual compass error
gyro flux(-)gate compass
gyro stabilized flux(-)gate compass
gyro-compass / gyro-unit
gyromagnetic compass system
gyro-unit / gyro-compass
radio compass
sighting compass