NOthing you can do about it, magic.
Someone else beat you to ergistering it, and unless they let it lapse, it's theirs. A competitor of ours made a website name that was very simliar and customers get us confused, so his strategy worked. Our option? We could buy him out I guess. The same tactics are at hand, though. Trying to "peel off" potential customers. I don't think it's as big of a deal as we thought it would be, because of how we run our business.
Does this Park Marine sell the same type of boats you do? if not, you don't have a lot to worry about, (if you sell Formula, and they sell Lund or Trackers or something). if so, that sucks. You can get another website name, like nemensmarine.net if open, or something else. Did you see if parkmarine.com/net/org/info, whatever was open? register them, link to your site.
It's only a big deal if you have a site and don't market it with search engines, then they'll go to the other marine site and you'll lose that. Otherwise, you'll pop up in the top 5 or so, and they'll figure it out if they're looking for you.
So, those are my thoughts....