wrote:


Astro navigation, but it's still an angle away from a standard
vector. So different sciences are using the same word with different
meanings.

However, you're of course correct that for magnetic navigation,
declination and variation are the same thing.

http://www.ngdc.noaa.gov/seg/geomag/faqgeom.shtml

Kev


Thanks to you, farr1220, and Peter. I always wondered in the back of my
mind how the term declination came to mean variation. Now I'm ready to
navigate the outer space :-)