The Yellow Scale

The Navigation Computer: The Yellow Scale

What is the purpose of the yellow scale? It is simply to allow you to convert from minutes to hours and minutes. If we use the ‘60’ black triangle for an hourly rate, we get the answer in minutes, even when it is in excess of one hour. Often, in aviation, we want the answer in hours and minutes.

Suppose an answer comes to 142.6 minutes. Looking at the yellow ring, you can see that this is between 2 hours and 2 hours 30 min. Therefore it must be 2 hours 22.6 min.

This is the sole purpose of the yellow scale

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