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A straight line on a chart 4.89 cm long represents 185 NM. What is the approximate scale of this chart?
  • A
    1: 3 500 000
  • B
    1: 5 000 000
  • C
    1: 6 000 000
  • D
    1: 7 000 000

The chart's scale depicts the ratio between the length depicted on the chart and the actual distance on planet Earth.

Chart Scale = Chart length / Earth distance

In this case, since the units of length are in different formats, our initial step is to convert them into a common unit:

1 NM = 1 852 m ⇒ 185 NM = 342 620 m = 34 262 000 cm

Chart scale = 4.89 / 34 262 000 = 1 / 7 006 544

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