Hi All from down under
Excuse my ignorance but how do I use a compass to advantage
when racing I sail an A Cat.
I know I can get a bearing on the top mark by sighting it
and getting a bearing but is there some way to work out
optimal tacking angles and or windshifts.

I also have a an onboard gps which I use for speed so I can adjust trim to suit etc..

So if someone can give a novice a few lessons on the above would be well appreciated.

Our club racing season starts this weekend so all fired up to get some adenalin back in the veins after a lousy winter.

Thanks in advance.