when i first started playing SH3, got into position to attack a convoy during the day, made sure everything was set up perfectly: AOB, distance to target, torpedo settings checked and counterchecked and tubes open...But i hadn't realized in the F6 screen that torpedo V would fire straight astern.

This threw me off so completely that I misfired on all of my other shots!
Destroyers counterattack. I dive deep and get depth charged. Run out of options so surface to try desperation torpedo shot. Was running silent so no tubes reloaded. Sitting duck. Dead duck.
Decided to search for help in a SH3 Forum and found you guys here at subsim.

Am no longer an embarassment to the Kriegsmarine.