Well, lesson learned: do not actually believe that a boat has the equipment listed in the ad/listing. But at least I had a scenic drive. Now need to call back to get a revised insurance quote on the likely boat and at a higher liability coverage ($500K) required by the likely marina. Good news: Comcast can add premium channels, etc onto the basic cable package that comes included with the slip at the likely marina, and I actually had a very positive customer service experience with Comcast. Also found out that a marina that said I could not add premium channels was wrong (wonder how many potential slipholders they've lost with the incorrect information) and that one of the marinas I had been considering is not wired for cable at all...guess that helps scratch them off the list.