[Beery]

The ship tonnages are located in the *.log and *.cfg files in each ship folder in the SilentHunterIII\data\Sea folder. They're listed in plain English in both files and you can use any text editor to edit them.

If you use SH3 Commander the process is different, as the data are kept in a single file called Ship displacements.cfg in the SH3 Commander\Cfg folder. Here you'll find the displacements which can be edited as desired, as well as the following:

[SETTINGS]
Precision=10

[DEFAULTS]
Upper=1.15
Lower=0.75
YearlyAdjust=1.02

To prevent the displacements from varying, change these values to read:

[SETTINGS]
Precision=1

[DEFAULTS]
Upper=1.00
Lower=1.00
YearlyAdjust=1.00

There will still be some very minor variations, as SH3 has hard-coded a few tons of variation for every ship in the game.