1. Aircraft....way to numerous in stock and specifically showing up in the middle of nowhere for not reason other than to make it interesting. Sure, there was quite a few aircraft but stock is a bit overkill. (go get Run Silent Run Deep) Be happy!
2. S class are much like your coastal Uboats. A whole lot of nothing but praying. If I'm not mistaken it was a point and shoot boat so turn off your TDC
. Diving depth not the greatest. Really, you take your life in your hands with this boat. A good challenge though. I had 5 successful patrols and final got new construction
3. Damage indicator....wet your thumb and stick it in the wind. If it is colder on the right side of your thumb you are dead. If it is colder on the left side you are dead. Thus ends the instructional on damage.
J/K. There is no % scale like SH3 has. Your best guess really. If you have bulkheads deep in the red and it takes hours upon hours to repair, your best course is head on home. Minor damage and not long to repair should indicate keep patrolling but with caution. Perhaps the new patch will address this issue.
4. Go get ROW (reflections on the water). Super environmental mod. Forces you to stop and smell the roses, think about your next move, slows down your time using TC. You will find yourself using real time in your attacks. Sometimes hours/days. Install the Natural Sinking Mod as instructed in the ROW main page.
5. Go get Capt Cox officer hat and insignia mod. The Italian fishermen hats just do not cut the mustard.
6. Complete your objectives. You can sink tonnage all day long but if you do not complete the assignments you will be retired. If you complete your objective with some tonnage to show for it you will eventually receive new construction. This part is not really renown based as far as I can tell.