I have turned the greek KI for this screenshot into a human player.
The Greeks lack both coal and oil, so their navy is stuck to pre-steampower units. And so they are massproducing the Pirate Frigate (Industrialization, 4/2/7) as it has two more movement points then the Frigate (4/2/5).
All pirate ships turn their prizes into transports of their tech level (Caravel, Galleon and Windjammer). And so the seas are littered with Windjammers waiting for pickup by an escort, as they are marked as "need Escort".
And no, they really have only 7 movement points, but the Greek have build the Naval Academy, wich gives them an additional movement point.
So far I have observed, that the Greek meet single Windjammers with a Corvette or Torpedoboat and then escort them into a harbor.
But most of them are anchored were they have been created and wait for an escort (or a pirate of another nation
).
I would say that the "need Escort" backfires here for the KI.
Second EDIT: I have now removed the "need Escort" flag from all transports, as they are been escorted anyway if they carry troops.
Only Aircraft Carriers have now the "need Escort" flag (the historical fate of the unfortunate HMS Glorious is a grim reminder, of what can happen to unescorted or inadequate escorted Carriers). I have also reduced the defence value of the carriers to 2 - 4 depending on type in order to avoid that they defend their escorts when attacked.
EDIT: And Korea is escorting a first generation Sampan (flavor unit for Galley) with an Armored Cruiser.
8 Cities are building Battleships and Heavy Cruisers, but none is building a more advanced transport. The Sampan is really their one and only transport.