Discussion
A navigation display range is set to 40 nautical miles and the screen is 6 inches tall. The scale is approximately
Answer: A
Correct answer: 6.7 nautical miles per inch
Divide the range displayed by the screen dimension over which it is drawn:
\[ \frac{40\ \mathrm{nm}}{6\ \mathrm{in}} = 6.7\ \mathrm{nm\ per\ inch} \]
Scale changes as the crew selects a different range, and with it the apparent density of the picture: at a long range the whole route fits but individual waypoints crowd together, while at a short range the detail is legible but the aircraft is soon off the end. Range selection is therefore itself a decluttering action.
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