Private Pilot Licence · Practice

Lines of longitude (meridians) converge toward the poles. The practical implication for chart scaling is:

• A.Longitude is unusable for any distance measurement at any latitude above or below the equator
• B.Distances measured on any chart are always doubled because of convergence at high latitudes
• C.No practical implication — nautical miles are defined by latitude not longitude in all cases
• D.One minute of longitude is 1 NM at the equator but progressively less at higher latitudes