I did my first 9 patrols in GWX in an IIa in the 1´st Flotilla before trading her in for an VIIc. Did not do any upgrades at all to her. In GWX you have 3 spare torps, so you can reload all three tubes. Well, she´s an school boat now.
How strong wind and rain intensity that you can man the deck gun in is set in the StormConditions= line in the .cfg file in ...\data\Submarine\NSS_Uboat7b folder, for the VIIb. It has been discussed in several threads.
The disappearing ship most probably reached it´s last way point and got deleted.
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