Hey, my friends and I are playing our first game of A&A with 1940 Europe 2nd edition and have a question.

If more than one Naval Base service the same sea zone (example, build a naval base in Central US so that there are two bases servicing SZ 101) then can the US ships there move 4 spaces as each base adds plus one, or can they still only move 3 spaces as the don’t say the bases stack?

Thanks so much!