Re: GURPS Boats...
Pyramid #3/64 has Ghostdancer's "Sailing the Open Skies," which has - you guessed it - naval style airships, using the Spaceships system. It's got some good modifications for existing systems, and some new ones - oars, sails (both of which have an aerial variant), and two coal-burning (with an option to use wood) steam engines, one for TL 4 and one for TL 6 (for TL 5, a simple solution is to use the performance of TL 6 but the endurance of TL 4).
You'll need Spaceships 1, obviously, and ideally you'll probably also want at least Spaceships 7 and possibly Pyramid #3/34.
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