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Refer to figure.
What is the straight line distance between Coal Aston aerodrome (53°18'N 001°26'W) and Skegness aerodrome (53°10.5'N 000°20'E)?

  • A

    66 NM

  • B

    64 NM

  • C

    62 NM

  • D

    68 NM

For this question, normally a plotter should be required to measure the distance from one point to another. But, the chart scale is not known and, even if it was known, since it is just an excerpt of an aeronautical chart, any scale distortion after printing cannot be guaranteed.

So, the following manner, as the safest one to measure the distance on a chart, is recommended:

  • Draw a straight line from the centre of the symbol of Coal Aston airport to the centre of the symbol of Skegness airport.
  • Transfer the straight line along a meridian (prefer a "clear" meridian, as free of symbols as possible).
  • Along a meridian, it states that "1' or arc is equal to 1 NM" and "1° or arc is equal to 60 NM".
  • Thus, since the line along the meridian is 64', then the distance is 64 NM.

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