Part of the problem is that SH3 counts warship tonnage the same as merchant tonnage which is entirely inaccurate in my opinion. Warships were typically measured in displacement tonnage of which there are a number of variables (Light, Full Load, Normal, Maximum and several others depending on the nation of registry) or deadweight tonnage, a measure of the actual weight of the ship but also generally including a number of variables.
A Gross Registered Ton (GRT) as it applied to merchant ships was actually a measure of interior volume of the potential revenue earning spaces within the hull and not a weight or displacement measurement at all.
Sometimes, other rules may be applied to tankers which are by definition, mostly empty space.
Combining displacement with GRT is comparing apples to hamburgers, a warship cannot have a gross registered tonnage since she has no potential revenue spaces and displacement is meaningless to a merchant since it would be mostly dependent on the weight of the cargo carried.
The USN lumped the two values together for scoring Pacific kills though, hence USS Archerfish tops the single patrol high-score list with her one kill, the aircraft carrier Shinano but comes in only 25th in total tonnage sunk. SH4 reflects this USN policy correctly.
As far as I can tell, the Germans counted warships seperately from merchants for credit and awards. It would have been nice if SH3 had done the same.
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