Using
those informations, I've done a Truce-Medina Ferry, it works perfectly in both directions. It's all in the OW Events 0 in the attachment. The Ticket Offices location events must also be changed (to point to the world map instead of directly to the destination), but I didn't bother making patches for them since a simple copy-paste from the original CT ROM (a BitMath and the ChangeLocation I think) is enough.
I'd like to make the Medina-Choras Ferry but I'd have to actually add stuff in the overworld code (instead of changing the Truce-Porre Ferry code like I did). Plus the Medina station is at a really bad place, the ship has to circle the whole continent just to reach the southeast of the town and sail to Choras...
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