Ive only played three careers. The first was at a friends house because my computer being a laptop of some years couldnt play it, in that career I got as far as mid 1941 before his missus put a stop to him playing it!! She did what a destroyer couldnt do!! That career was using stock SH3 anyway so wasnt as difficult.
The second career was when I managed to build this computer which is a monster and plays the game perfectly. In this second career I got as far as mid 1940 and then I found GWX on this forum and so I ended that career to start a new one.
The career im on at the moment is my third and my first using GWX and SH3Commander. So far I am in Jan 1940 on my seventh patrol. Also ive only been in the North sea (in this career) although im sure I am destined for the Atlantic as I should get a type VII soon.
Good hunting!