Originally Posted By: Glock-A-Roo

While land-based people often switch their GPS unit's horizontal datum between NAD27 (or other local datum) and WGS84 to jive with the paper maps they have, aviation and naval assets almost always stick with WGS84.
Modern nautical charts are now in WGS84, and scaled in degrees, minutes, and tenths of minutes. I believe aviation charts are likewise.

Note that one minute of latitude equals one nautical mile.
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