Satin varnishes
As another poster listed if sections of the interior are exposed to unfiltered sunlight (companionway, hatch frames, etc. you should consider to use an exterior grade UV protected varnish in these areas. Most exterior varnishes are usually 'gloss' products that can be made 'satin' finish or any combination between 'satin' and gloss by allowing to dry thoroughly or cure then 'hand rubbing' with a mixture of rottenstone, pumice and oil. For interior surfaces subject to wear (table tops, etc.) consider to use a 'bar top' varnish as marine grades of varnish are usually soft/flexible (easily marred/dented) 'spar' varnish. Bar-top varnish, rottenstone, pumice are available from most 'old fashioned' paint stores. BTW for the sole and companionway steps, etc. consider to use "ultimate sole' or find out what they are using on the gym floor at your local high school, etc. .... for better non-slip surfaces - these varnishes usually have some sort of 'soft polymer' added for extra foot traction.