I never found "easy" access to public transportation in Baltimore
, so I can't help with that.
There are a few "airport shuttle" services that serve BWI. This is basically a big van that will pick you (and various other people) up and take you to the airport
. It used to cost something like $15 or $20 per person. If you're willing to use an airport shuttle, you can look in the cruising guides
for any marina in Annapolis
, Baltimore, or in between.
I used to live at Anchorage Marina in Baltimore. They can easily accomodate catamarans along the outside pier. I think Baltimore Marine
Center has some cat-sized slips. These two marinas
are within a block of a well-stocked grocery store, which may be helpful when you come back.