The experiment performed to determine the ship vertical center of gravity. It consists of shifting a series of known weights transversally across the deck when the ship is free to heel. The resulting change in the equilibrium angle of heel is measured by the shift of a plumb-bob along a batten or by a U-tube. By application of this information and basic naval architecture principles, the ship vertical center of gravity (VCG or KG) is determined.
- In service inclining test system (ISITS) – A ship specific equipment consisting of a computer, a computer program and measuring devices, control devices and protocol devices. ISITS serves as an aid in determining the actual GM at the time the test is carried out.