Re: Liveaboard Commuting to D.C.
Another option is Magothy River (Ferry Point Marina) and then grab the MARC train from Odenenton. Baltimore? and again the MARC train?
Annapolis is expensive in a marina, but there are a few places on Back Creek/Weems Creek, or up the Severn where private homes have a few slips that they rent out.
Deale is a good option but getting further away.
Are you a retired vet? Could look at Quantico marina?