Given the context of "no map" it reads as it won't be a "zone" type of deal in it's initial implementation, which FFXI's airships was a semi-instanced map. More than likely given how the ferry in XIV currently is pretty badly designed they probably decided against it at the start and will flesh it out more down the line.

Kind of like how in FFIX you take the transport around Lindblum and it's nothing more than a quick transport without seeing said transition. It's just when you translate it the context is hard to fully to hard and in the letter it'll likely be more explained.