It's about time I adjust my steering compass (getting into foggy weather).

I've never done it myself before but it doesn't appear to be all that
difficult.

Here is my problem and question(s);

I'm on the Hood Canal. Plenty of open water and little or no water traffic.
However, there are no bouy lines, nav aids or designated ranges (there are
some navy ranges, but these are restricted).

I seldom have a crew so I must steer and take bearings and adjust the
compass by myself.

I have worked out my autopilot problems and it steers a very straight course
in calm water. The boat has a full keel so there is not 'dog tracking' due
to prop torque.

Here is what I wonder. Will my GPS COG be more accurate than hand bearings
(and eyeball measurement) of my autopilots steered course. Say, let the AP
steer long enough so the COG is steady for several minutes.

I have a Flux Gate compass as well but it doesn't have a self compensating
feature. To compensate it I have to use either the steering compass or the
COG or take bearings.

About the only factor that I think could effect the COG is a current set. I
think I can find a period at slack water where this will be nil.

Also, any recommendations on what to use for a non magnetic small screw
driver for turning the compensator magnets??

Thoughts, experiences??


Steve
s/v Good Intentions