contour line

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Related to Isogonic lines: aclinic line
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Synonyms for contour line

a line drawn on a map connecting points of equal height

References in periodicals archive ?
In North America, the division between E and W variation runs on an isogonic line, often referred to as the agonic line, which roughly extends from Minneapolis/St.
Edmond Halley introduced the isogonic lines or magnetic meridians in the southern hemisphere and Louis Duperrey situated the magnetic South Pole at 76[degrees]S and 135/6[degrees]E.
If the isogonic lines (the lines of equal air pressure between highs and lows) on the chart are bunched up and close together, expect turbulence aloft.