EASA NAV(A)intermediate
A chart distance of 7.5 cm represents 60.745 NM. What is the approximate chart scale?
Answer
1:1,500,000
Explanation
Convert the real distance to centimetres: 60.745 NM is approximately 112.5 km, or 11,250,000 cm. Dividing by 7.5 cm gives a scale denominator of 1,500,000. **Key takeaway:** Convert both chart and ground distances to the same units before calculating scale. **Glossary:** **Chart scale**: The ratio between a map distance and the corresponding ground distance.
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