isogriv


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isogriv

[′ī·sə‚griv]
(navigation)
A line drawn on a map or chart joining points of equal grivation.

isogriv

isogrivclick for a larger image
Isogrivs drawn on a lambert's projection.
A line drawn on a map or a chart joining points of equal grivation (i.e., the angular difference between grid and magnetic north).