Thanks Reise, i figure the real depth will be whats in the sim file, since thats one of the 3D model files for the ship.
Now i can go through the sims one by one and alter the _en files to the same values.
Hopefully that will give me accurate drafts
Haven't got an event camera or external view any more, unless i change realism settings to experiment.
With a bit of luck i won't need to now.