isogonic
Related Words
angledegreemagnetismcompassdeclinationvariationisolinecontourmapcartographynavigationgeodesygeophysicsmagneticnorthsouthpolelatitudelongitudecoordinateazimuthbearingorientationvectorfieldfluxintensitygradientisobarisothermisobathisochronegeometrytrigonometryvertexarcsectorplanesphereellipsoidmeridianparallelequatordeviationcorrectiongyroscopesextantastrolabecharttopographysurveyingmagnetometerdipinclinationprojectionatlas