Jake:

I think "Velocity Made Good" is the same as your actual boat speed minus the current and wind losses. This would not show you what your choice of tacking angle has done for you. Your GPS could show you your ideal tacking point though (if you like to bang the corners) by showing you the degree heading to your next mark. However, you have to know the ideal number of degrees that your boat performs while beating (Can you handle a 15 degree pointing angle?)

Wyatt