First, I'd like to say thanks for all of the responses. You guys have really given insight to someone who doesn't spend much (if any) time on the water. (Marine nav. is just a hobby of mine.)
Second, a big thanks to svHyLyte. Your explanation of Polars is exactly
what I was missing.
Originally Posted by svHyLyte
In terms of your question seeking a specific time of arrival...
Sorry, I should've clarified this part a bit. It was a problem about keeping a schedule that got me thinking, but my question here was not ultimately about that. It was mainly about staying on course with a variable speed, such as in a sailboat. And as I said, you have resolved that problem for me.