isogone

listen to the pronunciation of isogone
Английский Язык - Турецкий язык
izogon
Немецкий Язык - Английский Язык
isogonic line
A line on a chart or map showing points of constant magnetic declination
A line on a map connecting points of equal magnetic declination
an imaginary line connecting points on the Earth's surface where the magnetic declination is the same