The Japan Coast Guard currently operates 455 watercraft and 73 aircraft which 27 of them are fixed wing and 46 are Helicopters. The Shikishima class (PLH) of the Japan is the world’s largest patrol vessel.
The Japan Coast Guard Watercraft Designation are the ff:
PLH (Patrol Vessel Large With Helicopter)
Displacement: 6,500 tons class
PL (Patrol Vessel Large)
a displacemnt of 3500 tons class
PM (Patrol Vessel Medium)
a displacement of 500 tons class
PS (Patrol Vessel Small)
220 tons class
PC (Patrol Craft)
23 metres to 35 metres class
CL (Craft Large)
15 to 20 metres class
FL (Fire fighting boat Large)
FM (Fire fighting boat Medium)