Does it help us to have these Domain names (most of which are maritime oriented) pointing to lawboat.com?
No really. It only serves a purpose if someone were to type in one of those domains directly into their browser bar. Google doesn’t “see” them, as there is really no content on them
We do have some pretty good ones but not sure if it helps with our SEO?
No, unfortunately doesn’t help with SEO at all. The only benefit domains like that has is, if for example with accidentsonboats.com you put up a small “seo site” and all you spoke about was “accidents on boats” as the “problem” as posed your law firm as the “solution.”
Can you say whether this helps or makes any difference at all??
As above…but personally, I would still hang on to them. There is value to having them. In an “ideal” world, where you had limitless budget, you would put a new site on all of those and present your law firm as the “solution”.