Penguin
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I beg to differ. I count the frigates as frigates, not OPVs. Next, consider the specs for the Island class OPV and note its range (which is crucial for 'off shore' qualification)6x Island Class
1x Hainan Class (converted to an OPV)
2x Kraljevica Class
1x Sea Dragon Class
1x Type-010G Class (MCV but equipped and used as an OPV)
2x Leopard Class Patrol Frigate
1x Salisbury Class Patrol Frigate
These 3x frigates are used for patrol and training purposes. According to Wikipedia BN has only 6x OPVs, i.e. the Island Class but there are other classes of OPVs which they have just classified as patrol craft.
1,260 tons
53.5-59.5 m
16.5 kt
7,000 n miles at 12 kt
The only thing that comes close is the South Korean built Sea Dragon (originally designed as OPV, so no surprise. I agree this is indeed misclassified):
635 tons
60.8 m
24> kt
6,000 n miles at 15 kt
Now, lets look at 2 more classes of surface combattants you mentioned:
Durjoy class (Type 037 'Hainan' class) submarine chaser/ Large patrol craft
392 tons
58.8 m
30.5 kt
1,300 n miles at 15 kt
Karnaphuli class (Kraljevica Class) Large Patrol Craft
245 tons
43.1 m
24 kt
1,500 n miles at 12 kt
Given their range, these at best can be used inshore. Given their limited displacement and relatively high max speed, however, they are best termed patrol boats.
Then there is the Type 010G Class Minesweeper/Patrol craft
590 tons
60 m
14 kt
3,000 n miles at 10 kt
This is similar in displacement to Sea Dragon and similar in speed to Island class. It's range is superior to the Hainan and Kraljevica patrol craft but at best half that of the Sea Dragon and Island classes. To the extent this is used for patrol, it would be Inshore Patrol Vessel. But what I don't understand then, is why the Shapla (River) class Minesweeper/Patrol class/Survey ship wouldn't be also called IPVs. They certainly have better range than the Type 10G:
Shapla (River) class Minesweeper/Patrol class/Survey ship
890 tons
47.5 m
14 kt
4,500 n miles at 10 kt
But perhaps they and the Type 10G are better just called what they are: MCM vessels. Both are in fact a fleet support auxiliaries.