Hi maillemaker!
You can change your uboot number and update the captain name using the data\applications\OptionsFileEditorViewer.exe little program. You have to activate the program, load the file "TheDarkWraithUserOptions.py" located in data\Scripts\Menu and look for the label "Ships Journal". There is the possibility to change the uboot number and the captain name. Once all is done, go to the File option of OptionsFileEditorViewer.exe and remember to click Save to accept your changes!
Torpedo