::Hey Andrew,
Forgot to mention another thing; the main image on the points of sail would be  Image:Points of sail for single sail, double masted sailboats .I recently went over the sailing for dummies book again and here, 2 masts with sails are shown for the schematic, this is more accurate (most common sailboats have only but 1 mast but 2 sails which work like a 2 masted sailboat with 1 sail per mast. In a schematic it is best to simply draw 2 masts with 1 sail. The reason why this is done (besides being just more accurate) is also because it makes a noticable difference at 180° to the wind (running); here sails are placed "goosewinged", so the efficiency and method is similar to a square rigged ship at this coarse. With a image you have now (1 sail, 1 mast) this isn't possible and so the image if faulty in a way. This is btw also the reason why I myself got a little confused at first on this. I mentioned before that you could make a square rigged sailboat points of sail; with this suggestion this would not be so required; instead you could best make this image first and not bother about the other image any time soon.