I've recently come across this as keal/kg.

It looks like typo for "keel", Bingley. Keel weight is an important consideration in the design of a keel.

This is over my head, but it may mean something to you:
[BTW this search also turned up "squat and trim" which is interesting.]

"The distance of the the center of gravity above the keel (KG) only minimally influences the behavior of the ship (Graph 3):

Only a minimal dependence of the squat on the KG (DKG up to approx. 3 m) could be measured in the investigation with the PPM 350.

An increase in the distance of the center of gravity above the keel causes a "softer" ship behavior in waves. There is no definite influence of the size of the KG on the trim angle in calm water.

Graph 3: Influence of the distance of the center of gravity above the keel (KG) on the squat and trim of very large PPM container ships (here with a length of 350 m) (60 KB)

A prognosis for the squat and trim behavior of large PPM container ships is not possible on the basis of "classic" analytical and empirical approaches, as has been shown in a comparison of calculations and measurements in a hydraulic model (e.g., squat in Graph 4):

http://www.baw.de/vip/en/departments/department_k/projects/squat/squat_laenge-en.html

I've enjoyed this little nautical excursion, Bingley, thanks. I might just do a post on some nautical terms in ship design including "squat and trim" and "coamings" [which turned up also].