Ships and Aquatic Campaigns

[GideonRiddle]

My DnD group is shortly going to embark on an Aquatic adventure and was asked to make a lv. 10 specialized team for it. I decided/got permission to play a Dungeon Lord(PrC from Dungeonscape) and I am searching for info as to where my "dungeon" (our ship) ends.

So I was hoping that the Playground may have an answer. If an intruder leaves the ship but is still next to it is he "out" of the dungeon? How far does my power extend from the ship itself?

This is all assuming that the ship is in the middle of nowhere.
Thanks in advance for any advice/answers.

[Fyermind]

I'd say touching your ship or in the space of the rigging counts as in your dungeon.