Since I haven't found any postings about it any time recently, here goes: Dry Dock Cafe at 7 Dry Dock Ave in the North Coast Seafood building at the Black Falcon terminal (where cruise ships park) in the Seaport district...
In a word, it's a truly terrific local (not tourist-oriented, though they do enjoy some of the cruise ship traffic, especially for breakfast, I think) alternative to other Seaport options (Aura=OK, but pricey -- Jimmy's, Anthony's, No Name, and Daily Catch Fan Pier are each now disasters for their respective reasons -- see prior postings on the board on this topic, and The Barking Crab, while a fun tourist destination with decent eats, is overpriced for what it is). Now I've found the answer...at least perhaps until I venture to Morse Fish on Washington St...
Dry Dock gets REALLY fresh seafood every day and prepares it simply, whether broiled or fried. Their seafood chowder is the best I've had ANYWHERE --creamy, delicious, richness FULL of shellfish and a few potatoes.
Co-workers and relatives have all consistently been impressed. The fried fish sandwich is perfect (haddock) ... and huge. There's a big dose of garlic in the tartar sauce and the coleslaw that comes with it. The broiled swordfish I had yesterday was spectacular. Other great choices have included the broiled sole, broiled cod, salmon wrap (huge!),and fried seafood platter.
The non-seafood, non-basic options haven't been as good to date -- no one I've been there with has really enjoyed the pastas or stir frys.
The service is informal, efficient, and friendly. Prices range from $6-8 lunches to around $14-$16 for very generous dinner plates and specials.
Overall, it's a great option if you are in the Seaport area during the limited hours and want no-frills fresh seafood.
I can't find a website or menu -- it's open for breakfast through lunch (7a-2p?) M-F and recently 5-9p on Thurs and Fri for dinner (haven't been yet -- pretty sure it's BYOB at best).
There a FEW, usually full visitor parking spots in an otherwise reserved lot, but creative parking possibilities are around on the surrounding streets and there's a public lot next door.