A few more questions

[Zergos1985]

Guys I have a few more questions (I'm noob sorry, I just started playing, this is the last thread of this kind I promise)

1. Why do we have the observation periscope? Isn't the attack one sufficient? Has anyone ever used the obs periscope?

2. "Hard to Port" will make a 90 degrees turn to left, correct? Cause it seems more than 90 degrees when it does it... :-S

3. When do we have to press J (Deploy Decoys)? What do these decoys do?

4. What does the command ' (Rudder Amidships) do? I understood that the "Rudder" is that thingy that moves when you turn left or right... helps with the steering... but I didn't understand the command

5. Is there any writen tutorial on the forum that teaches you how to find out speed and aob or other cool stuff with the compass and the other drawing tools?

6. The dudes from my crew have properties like this: 30/105 (+10)
If I got it right 105 is how qualified is the dude in percents for the current position. In the current example the dude would be more than perfect. 10 seems to be the bonus he receives from the teammates. What is 30?