I've done ship chains many a time, it is a great strategy, especially after industrialization. When you're moving 50-100 units, doing it in one turn is not only speedier but safer, since you won't have a huge 100 unit convoy vunerable to attack. Mass movement in one turn, the trick is just to set it up. Be methodical, and overcompensate. i usually make more transports than i need just so i have an emergency stash. Also, Magellan's Expedition helps greatly