Hi scalelokt,
The Keel of the ship is indeed listed under the Ship Recognition Manual, although it is listed as the ships Draft, which is the same. It's a wee bit confusing if you go in there looking for the word Keel. The Draft of the ship is the depth the hull of the ship submerges to underwater, measured from the waterline to the bottom of the ships Keel.
Hope this helps mate, and makes busting open those Large Tankers a little easier
