Measuring Distances

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Figure 4.2-21 Plotting North/South Direction
Measuring Distances
In navigation, the standard for distance measurement is the nautical mile. On Lambert
conformal projections one nautical mile equals one minute of arc measured along any
great circle. All lines of longitude (meridians) are great circles; therefore, one-degree (60
minutes) measured along a meridian equals 60 nautical miles. It is important to understand
that this is NOT a degree of longitude, but actually a degree of Degrees of latitude
are marked on the longitude lines. Never measure distance along a parallel. On Lambert
Conformal charts a course line is a segment of a great circle. To find the distance of the
course, compare it's length to an equal length of another great circle (any meridian).
(Figure 4.2-22)
4.6-41

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