A_{wp}

is the waterplane area at the survival
draught including the effects of bracing members as applicable (in square
metres).

A_{w}

is the effective wind area with the
unit in the upright position (i.e. the product of projected area, shape
coefficient and height coefficient) (in square metres).

BM

is the vertical distance from the
metacentre to the centre of buoyancy with the unit in the upright position
(in metres).

D_{m}

is the initial survival draught (in
metres).

FBD_{o}

is the vertical distance from
D_{m} to the top of the upper exposed weathertight deck at the
side (in metres).

GM

for paragraph 1.2.1.1 , GM is the
metacentric height measured about the roll or diagonal axis, whichever gives
the minimum restoring energy ratio, 'B'/'A'. This axis is usually the
diagonal axis as it possesses a characteristically larger projected wind
area which influences the three characteristic angles mentioned
above.

GM

for paragraph 1.2.1.2, GM is the
metacentric height measured about the axis which gives the minimum
downflooding distance margin (i.e. generally the direction that gives the
largest QSD_{1}) (in metres).

l _{wp}

is the waterplane second moment of
inertia at the survival draught including the effects of bracing members as
applicable (in metres to the power of 4).

L_{ccc}

is the longitudinal distance between
centres of the corner columns (in metres).

L_{ptn}

is the length of each pontoon (in
metres)

S_{ptn}

is the transverse distance between the
centreline of the pontoons (in metres).

V_{c}

is the total volume of all columns
from the top of the pontoons to the top of the column structure, except for
any volume included in the upper deck (in cubic metres).

V_{p}

is the total combined volume of both
pontoons (in cubic metres).

V_{t}

is the total volume of the structures
(pontoons, columns and bracings) contributing to the buoyancy of the unit,
from its baseline to the top of the column structure, except for any volume
included in the upper deck (in cubic metres).

VCP_{w1}

is the vertical centre of wind
pressure above D_{m}, (in metres).
