Hi Rick!
Your map is awesome! And I love the idea, it would make a very interesting game if you were to make good use of the awesome unit packs that have been released by a number of excelent unit makers, so as to make each civ more unique! But its a hell of a big job I warn you!
I have a sugestion, an alternate version of your map with the right most islands removed so as to make a big ocean, it makes the late game naval warfare more interesting, aegis cruisers (if I remember correctly) are important because of their double visibility, carriers so you can carry bombers and fighters across big distances, submarines for hit and run attacks, destroyers for patrolling and submarine detection, lots of possibilities. Also for the early part of the game, you could make the early ships unable to cross oceans by using the "Wheeled" trick, you flag Galleys and stuff (ships before the Caravel) as "Wheeled" and then flag the "Ocean" terrain as impassable for wheeled units, and voila, Galleys cant move to oceans, although they may still move to seas and sink in them if you want