Being a neophyte to cat racing the only question I can think of with all of this - is do you really have the time to fiddle with a GPS trying to figure what is the best course –tack in the heat of a race? From my personal experience last summer, my hands were full handling the boat, watching for other boats, and feeling the wind watching the water & working off my gut. That seems to work for me with my recent collection of mantel hardware. IMHO I would rather learn how do this with instinct in place of electronics for the mere fact what happens should the batteries go dead.

What's next stall warning horns for apparent like they have in airlines?
"Dweidle Dweidel Dweidle Fall Off Fall Off you going to slow - Dweidle Dweidel Dweidle"