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
declination constant
declination protractor
declination statement
declination station
bearing grid angle
Global Information Grid (GIG)
grid azimuth
grid bearing
grid convergence
grid convergence factor
grid coordinate system
grid line
grid magnetic angle
grid north (GN)
grid note
grid reference box
grid reference system
grid variation
interval of grid lines