кут зближення меридіанів
grid zone / grid-zone
grid zone designation / Grid Zone Designator
JAN grid / Joint Army-Navy grid
declination
declination diagram
magnetic declination
declination aiming circle (declinated aiming circle)
declination chart
declination index
declination pin
angle of declination
magnetic variation / magnetic declination
map declination
bearing grid angle
Global Information Grid (GIG)
grid
grid azimuth
grid bearing
grid convergence
grid convergence factor
grid coordinate system
grid coordinates
grid interval
grid line
grid magnetic angle
grid north (GN)
grid note
grid reference
grid reference box
grid reference system
grid system of communications
grid variation