@benkramer thanks. It's nice in this view, you can really see how real navigation works. I will confess that for this map, I've guessed/drawn those rhumb lines by hand, they are probably a fair bit wrong. It's fine, that map is still more accurate than any map that would likely exist in Toril, but I'd like to do better next time....
@benkramer I was thinking if it would be fun to run realistic navigation with the players on a map like this. Print it REALLY big. Twice. DM has her map, marks the exact location, players give the heading they want to sail, rolls are made for perception, survival, navigators tools, the real heading they move in is then known to DM who describes the features they can see from the crows nest. Players then have to figure out where they are. Map has many dangerous areas marked...