Bolty,
Did you have enough time to complete it??
Yes, I had fifteen minutes to spare which was the least remaining time of all the exams by a long way. Just enough to cover some of my unsure questions before collection time.
From my experience, these things kill time in the Gnav exam:
1) Spending time working out problems using Pythagoras (or other relatively complex problems) when the correct answer is logically aparent just by looking at the alternatives.
2) The CPR-5 work: You absolutely essentially must just practice your CRP knowledge. I was asked to work out all sorts of things. 1/3rd of the questions were CRP based and they used up more than 1/3rd of the available time!
3) Make sure your plotting is good: If I recall correctly, there were quite a few points up for grabs there.
4) Be efficient, if you are stuck on a 1 pointer, mark it to come back later and move one.