TheDarkWraith, you are on the good way.

But no mean to know wich part of the boat is underwater...
If you are right, it is not the boat height which is wrong in the CFG files but the way the program is following to do his calculation. It is too complicate for me

to search how the program do so I try another way but if you could try (I know you or DUCIMUS can! I have download some mods you have made

)... it would be great.
Otherwise, I can do what REAPER7 told me and he will modify the recognition manual by adding a marking... I have tried but for some ships, it is hard to find a valid point to pick up... For example, target at 1000 meters... :