Figured the manual was 'over-extending' itself...needed confirmation.
Thanks Fincuan
.
From reading threads here, I think the mods to have are;
Trigger Maru
Real Fleet Boat
Run Silent Run Deep Campaign
Reflections on the Water
Natural Sinking Mechanics
I was hoping for a current link to the 'tools'.....but I'm sure I can find it in the mods section.