Chronicle of naval war 1939-1945

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Significant information here on conduct of the naval war.

Chronicle of naval war 1939-1945
https://www.wlb-stuttgart.de/seekrieg/chronik.htm#Z

Register of naval units here:
https://www.wlb-stuttgart.de/seekrieg/r ... frames.htm

Unfortunately, it is all German. If you install a language-translater plug-in for your browser, should make it easier (although some of the wording may appear ackward).

Additionally, you may encounter both (GRT) and (BRT) terms being used. You can treat BRT as the German version of GRT.
(see - https://www.wikiwand.com/en/Gross_register_tonnage)

GRT is basically, the ship's total internal volume. In contrast, the Net Register Tonnage (NRT) is the cargo capacity of the ship.

FYI - The US Coast Guard has a "simplified" formula for converting from GRT to NRT as follows:

15. NET TONNAGE FORMULATION
The Simplified tonnage formula for net register tons for any vessel is:
NRT = M x GRT
The machinery factor (M) is as follows:
M = 1.0 for non-self-propelled vessels or propulsion machinery outside the hull
M = 0.9 for vessels designed for sailing with propulsion machinery inside the hull
M = 0.8 for vessels not designed for sailing with propulsion machinery inside the hull

(see - https://www.dco.uscg.mil/Portals/9/DCO% ... 123757-680)

For almost all cases regarding relavant 1939-1945 cargo shipping vessals, it would be:
GRT * 0.8 = NRT