Many moons ago I invented a new road system called the Sea Lane. It essentially gives ships that used them increased movement. I created a nifty "advanced" looking graphic that pulsed in the ocean, but certainly it could be used with more subtle graphics such as a buoy. I offer this idea to your mod. You could reduce all ship movements by 1 or 2 then allow this technology to supplement movement. I used several ships to "build" the sea lanes and my play testers really enjoyed the addition to the bland oceans of the game (at least 60% of the map) http://forums.civfanatics.com/showthread.php?t=372481 Cheers!