id	definition
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