[aprssig] grads and other funny angle measurements

[Jon Kåre Hellan]

Alan P. Biddle wrote:
> Dividing a circle into 400 grads has the advantage that it is very easy to
> mentally compute a reciprocal heading.  Getting this right is of some
> interest when you are calling in artillery fire.  ;)

Going hiking when one of you has a 360 degree compass and another a 400 
grad one gets interesting. We quickly got rid of the 400 ones.

Jon LA4RT