Hi,
I was homeschooled as a kid, but not on a
boat. This was quite a few years ago now.
We (siblings and I) used a workbook-based curriculum. This was great because it allowed the student to go at their own pace.
Because of this I would suggest
buying the
books for their grades you intend to cover, and a few beyond that. It's not uncommon to cover 2-3 years of lessons in under a year.
There is a lot out there about teaching home-schooled
kids and how to give incentives to learn. It's important to set goals and to give motivation. Obviously this will be different on a
boat. Maybe "if you can get through these lessons we get a day off to explore!" or something?
Of course it will have to be tailored to you.
If you want well-educated
children, your goal going into this
MUST be to teach your kids. Not to supplement their education because
YOU want to sail (or in my case, because my parents wanted to spend time with us).
It has to be a selfless activity on your part. Otherwise your
children will be lagging behind their peers.
If done right your kids can have a much better education and it will be extremely rewarding to you and to them.
Also, I would think outside the box. The most beneficial things for me personally was to:
1) Read a LOT of
books (rather than just "learn the rules" in
English class)
2) Learn programming
3) Have fun with math
I would also suggest giving your kids a leg-up and throw some languages in the mix. My parents hated languages so I did not have this advantage. Much easier to learn a second or a third language when you're young. This will also be a great chance for you to learn the language, too.
Just because you don't like a specific subject don't ignore it or just do the bare-minimum. For one, it is an awful example to your kids to ignore what is hard. Second, it is throwing away an opportunity for you to enjoy that subject.
Honestly it is learn-as-you-go for both you and them. Find what works. Teach them as much as you possibly can. If you are overloaded, reevaluate. If the subjects are too easy for your kids, reevaluate. And so on...
And read!