478. The COASTAL DRILLER, in transit with winds less than 70 knots, has a draft of 10 feet 8 inches. The VM are 541,257 ft-kips, FSML are 32,000 ft-kips, and FSMT are 24,000 ft-kips. The margin on the maximum allowable KG is __________.

The margin on maximum allowable KG is calculated by subtracting the vessel's virtual KG (including free-surface effects) from the allowable KG at a given draft. Using the provided data for the COASTAL DRILLER at a draft of 10 feet 8 inches, the margin is 23.7 feet.