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Rules of Thumb
From SKYbrary Wiki
| Article Information | ||
|---|---|---|
| Category: | Theory of Flight | 
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| Content source: | SKYbrary | 
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| Content control: | EUROCONTROL | 
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Definition
A rule of thumb is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. It is an easily learned and easily applied procedure for approximately calculating some value. It is particularly useful as a means of cross-checking information being displayed by aircraft navigation and flight management systems.
1 in 60 Rule
1 Degree offset angle equates to 1 nm displacement at 60 nm from a origin.
Distance off track = (number of degrees off course x distance to station)/60
Slant Range
Overhead a DME the indicated range will be equal to the altitude of the aircraft.
Slant Range Overhead DME = Altitude in feet/6000