20 / 20
In a navigation chart a distance of 49 NM is equal to 7 cm. What is the approximate scale of the chart?
  • A
    1: 130 000
  • B
    1: 700 000
  • C
    1: 1 300 000
  • 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 ⇒ 49 NM = 90 748 m = 9 074 800 cm

Chart scale = 7 / 9 074 800 = 1 / 1 296 400

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.