The nomometer is basically a static slide rule or calculator. When you draw a straight line through all three scales, the crossing points match up in a meaningful mathematical way. Draw a line through 30 minutes and 5 kts and I guarantee you that the line will also pass through the 5000 yd mark on the range scale, for example.
Hint: 0.5 hrs x 5 nm/hr = 2.5 nm (5000yd).
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