Celestial navigation glossary
Deviation
Compass error caused by the boat’s own iron and electrics; it changes with heading.
Where the course teaches it
Compass error and deviation, in the module Checking the compass by the Sun. Find the compass error and deviation from the Sun's bearing at sunrise or sunset.
Taught alongside it
- Amplitude
- The Sun’s bearing from east or west as it rises or sets: a check of the compass.
- Compass error
- True bearing minus compass bearing: variation plus deviation.