I am having realy hard times with real navigation. Consider how usable is this:
First position fix,
second position fix.
Check their time, speed and course. Actually 90% of that time i was at 8knots - its flank ahead submerged. (You can see the course 79 upper, its that line - and thats exactly the line where i have to be).
At start of that line i was heading to the north and just order 79 degree bearing, flank ahead, how could i be on the south?
How with this i can use any other method to engage my target than visual? Do i need to wait for good weather or day? The bad weather is best for submarine.
If this would be real action, i would throw that man over the board to spare some food for others and i would start do his work as my second job on the boat..