Hey thanks guys!
James, to answer your question, the blue portion of the base is a piece of styrene cut to size, sprayed with a gloss blue, and then glued to a wood base that was painted black.
I had considered using some blue poster board, but decided not to just in case the glue to secure it to the base, and the glue to secure the ship to the board, would "bleed" and maybe mess up the presentation. Then again, sealing the board with a paper sealer would lessen that worry, so it's something to consider in other projects...
Rui, I really enjoy JAG's products. When I get some other projects out of the way, I want to build their other USCG ship and the USS Long Beach!