What is the chart distance between longitudes 179°E and 175°W on a direct Mercator chart with a scale of 1: 5 000 000 at the Equator?
Charts represent the “reduced earth”.
The chart scale represents the relation between the length represented on the chart compared with the real distance on planet earth.
Chart Scale = Chart length / Earth distance
Distance on Earth, departure = 60 x 6º x cos (0º) = 360 nm
As the units of length are in different units, first we must convert them for the same units:
1 nm = 1,852 km
360 nm = 66672000 cm
Chart length = 66672000 / 5 000 000 = 133 mm
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