Re: Course to steer at a given speed.
This is good for a power boat and for 'testing' purposes but sailboats generally don't have the luxury of setting an exact speed, and certainly not one over hull speed.
Additionally for sailboats you have to factor in leeway, which of course depends on the boat, the wind, and which tack you are on.
If the purpose of the exercise is to hit an exact spot at an exact time - again, good for tests and the USPS (US power squadron) type contests. On sailboats it just ain't practical.
Lessons learned are opportunities earned.