Immortal Captain's Advantages, a Solar Sail Charm from Ink Monkeys, is just great. It give you motes to power your Sail Charms and it makes so using Sail Charms no longer counts as a Charm activation.
Sea-Scanning Glare, an Abyssal Charm, is a useful way to give your character awareness of the environment, and it has a Solar mirror.
Though this may be out of your reach, Sidereal Sail is just full of excellent charms, letting you take your ship and your passengers anywhere. There's not much to do with sailing boats in the Sidereal Sail, but there's a lot to do with getting from one place to other, obstacles be damned.
As for the Solar Sail charms in the book, the ambush charm is fantastic. Being able to hide anywhere is a huge advantage.
You can dare to do anything and succeed in anything, provided you never forget that two and two do not make four; in clumsy hands, they often make three or even less; but they can make five or six. - Louis-Herbert Lyautey