Measurements defined as follows will be taken in order to calculate a particular yacht’s rating:
Weight
DSPW Total measured weight of a boat in measurement trim
DSPWD Total declared (published) weight of a boat in measurement trim
Hull
LOA Length Overall – Of longest hull, excluding rub rails, railings, anchor rollers etc.
FO Forward Overhang – Horizontal distance from the forwardmost part of the hull to where the stem, or a straight projection thereof, cuts the waterline.
FF Forward freeboard – Vertical distance from the forwardmost part of the hull to the waterline
AO Aft Overhang – Horizontal distance from the aftmost part of the hull to where the stern, or a straight projection thereof, cuts the waterline.
Y Aft freeboard – Vertical distance from the aftmost part of the hull to the waterline
OSB Distance between the outermost stems of a trimaran or the stems of a catamaran
TP Type , number of propellers  none, One folding, One fixed, Two Folding, Two fixed
V Maximum draft to underside of hull or fixed keel if present
TH Hull type – Catamaran, Trimaran
Daggerboards and Foils
TB Board type – None, Standard, Asymmetric, CBoard, L or TBoard
BV1, 2, 3, 4 Board /Foil 1, 2, 3, 4 maximum exposed vertical length
BH1, 2, 3, 4 Board /Foil 1, 2, 3, 4 maximum exposed horizontal length
BC1, 2, 3, 4 Board/Foil 1, 2, 3, 4 maximum cord
Mast
TPC Mast control type – Fixed, Rotating, Canting or Both
PC Circumference of rotating mast
PCY Circumference of rotating mizzen mast

PU Vertical distance between the top of the mainsail hoist and the clew

PL Vertical distance of mainsail clew above or below tack

E Maximum outhaul distance perpendicular to mast

MHB Top width

MUW Upper width

MTW Threequarter width

MHW Half width

MQW Quarter width

PUY Mizzen hoist

PLY Vertical distance of mizzen clew below or above tack

EY Maximum outhaul distance perpendicular to mast

MHBY Top width

MUWY Upper width

MTWY Threequarter width

MHWY Half width

MQWY Quarter width

IG Forestay height

J Foretriangle base

HLU Headsail luff length

HHB Top width

HUW Upper width

HTW Threequarter width

HHW Half width

HQW Quarter width

HLP Perpendicular distance from clew to luff

SLU Length of luff

SLE Length of leech

SFL Length of foot

SHW Distance between mid points of luff and leech

CLU Length of luff

CLE Length of leech

CFL Length of foot

CHW Distance between mid points of luff and leech
Main Sail
Mizzen, 2^{nd} Main Sail
Headsail
Spinnaker
Screacher
The following values are calculated and form part of the final TCF value:
Weight
DC Crew weight allowance
RD Rated displacement
Hull
RL Rated length
CCH Catamaran correction for main and headsail
CCS Catamaran correction for main, headsail, spinnaker
CCC Catamaran correction for main, headsail, screacher
CCSC Catamaran correction for main, headsail, screacher, spinnaker
VA Fixed keel allowance
TPF Propeller type Allowance
Daggerboards and Foils
BVA Vertical projected area of daggerboards
BF Daggerboard factor
VF Keel/Daggerboard factor
BHA Horizontal projected area of boards / foils
Mast
P Mainsail hoist
PY Mizzen hoist
PA Mast area
PAY Mizzen mast area
Main Sail
MA Mainsail area (as per IMS)
MER Mainsail efficiency ratio
MEF Mainsail efficiency factor
RMA Rated mainsail area
Mizzen / 2nd main Sail
MAY Mizzen area (as per IMS)
RMAY Rated mizzen area
Headsail
HA Headsail area calculated (as per IMS)
HER Headsail efficiency ratio
HEF Headsail efficiency factor
RHA Rated area of headsail
Spinnaker
SA Spinnaker area calculated (as per IMS)
RSA Rated spinnaker area
SMG% Ratio of SMG to SF
Screacher
CA Screacher area calculated (as per IMS)
RCA Rated screacher area
CMG% Ratio of CMG to CF
Rated sail areas
RSAH Rated sail area headsail only
RSAS Rated sail area with spinnaker only
RSAC Rated sail area with screacher only
RSASC Rated sail area with screacher and spinnaker
Stable wind speed
WR Righting moment
WH Heeling moment
WS Upwind windspeed in knots
Speed prediction
VVH Predicted velocity headsail in knots
VVS Predicted velocity spinnaker in knots
VVC Predicted velocity screacher in knots
VVSC Predicted velocity spinnaker and screacher in knots
Lift factor
LH Lift in kg headsail
LS Lift in kg spinnaker
LC Lift in kg screacher
LSC Lift in kg spinnaker and screacher
LFH Lift factor headsail
LFS Lift factor spinnaker
LFC Lift factor screacher
LFSC Lift factor spinnaker and screacher
Ratings
TCFH TCF headsail only
TCFS TCF spinnaker only
TCFC TCF screacher only
TCFSC TCF screacher plus spinnaker
TCFLH Light wind TCF headsail only
TCFLS Light wind TCF spinnaker only
TCFLC Light wind TCF screacher only
TCFLSC Light wind TCF screacher plus spinnaker