EASA NAV(A)basic
Arrange the steps required to calculate ground distance in kilometers from a distance measured on a 1:50,000 scale map.
Answer
Measure the distance between the two points on the map in centimeters, Multiply the measured distance by 50,000 to obtain ground distance in centimeters, Divide the ground distance in centimeters by 100 to convert to meters, Divide the ground distance in meters by 1,000 to express the final ground distance in kilometers
Explanation
A chart measurement has no real-world meaning until interpreted with the chart scale. Measure the plotted route, multiply by the scale conversion, then convert units if required. **Key takeaway:** Read the scale before interpreting chart measurements.\n\n**Glossary:** **Scale ratio**: relationship between chart length and corresponding ground length.
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