BC       Barge Carrying Vessels (Lash & Seabee)
BD       Bulk-Dry
BI       Barge-Inland
BK       Bulk-Undetermined
BL       Bulk-Liquid
BO       Barge-Oceangoing
CB       Conbulk
CT       Container
DG       Dredge
DP       Display Vessels
FH       Fishing
GC       General Cargo
GT       Government-Non-Military
MT       Military
PC       Partial Container
PS       Passenger
RR       Roll on/Roll off
SP       Supply Ship
TG       Tug
VH       Vehicle Carrier