I'm intrigued by the comment you made about his interest in ships. There are so many different areas of learning that you can bring up while on the subject of ships.

Literature - many stories are written about sea life
History - naval and civil history
Economics - the use of ships for trade
Social Studies - The cultural impact of travel and trade by sea
Astronomy - Celestial navigation
Science - structure of ships, surface tension, displacement, Weather, oceanography, engineering, physics
Math - Calculating distances traveled, chartng courses, figuring out speeds, cargo value, supplies needed to make the journey etc.

And I'm sure much much more smile

I believe I remember that Kriston when she started Home Schooling fitted a variety of subjects around the subject transformers? smile

I think my point is not to worry if the initial focus seems narrow. There are alot of ways to work out a curriculm even if the topic seems very narrow. If you have a topic, post it here and I'm sure you'll get lots of ideas from us! Probably more than you want or need. smile