Tag Archives: Scale

In a navigation chart a distance of 49 NM is equal to 7 cm. The scale of the chart is approximately:

A: 1: 130 000
B: 1: 700 000
C: 1: 1 300 000
D: 1: 7 000 000

 

 

 

 

 

 

 

 

Answer: C

First you must change to one standard unit, let’s use cm, m and km.
1 nm = 1.852 km
49 * 1,852 = 90.748

90.748 / 7 = 12.964
so 1cm = 12.964 km on the chart
100 000cm = 1km
so
12.964 * 100000 = 1296400 = 1 300 000
1: 1 300 000