Re: Gen Nav
Agree totally with HWD's points.
This was the only exam where I found time was a problem. I went into the exam thinking that Gen Nav was one of my strongest subjects along with Met. I came out thinking I'd blown it (luckily I still got 86%) BUT I ran out of time with three questions not done and one of them was a 3 pointer (unforgiveable); lousy exam techinique on my part escpecially as the guys at BGS had drummed into us - 'find the 2 & 3 point questions first!' the 2 & 3 point questions are not any harder they just take up a little more time.
As HWD says you will save loads of time if you are totally comfortable with the CRP5 and read the questions very carefully - the questions look similar but they are often asking for different things: like asking for HDG/GS when you wouldn't apply drift and Track/GS when you would apply drift etc.
In any exam with numerous questions if I can't answer the Q straight off or do the calculation in 2 minutes I make a note of the question number and come back to it at the end. You will find that you often come back to a number of questions with more time left than you think - pressure off!
Having said that - if you know your stuff the Gen Nav paper isn't hard just watch the time. One guy did the paper with me, finished with 45 mins to go and scored 98%!!
Good luck.