Thanx for your replies. I'm doing a residential course at the glasgow nautical college. I honestly don't know how people can do this distance learning, if it wasn't for the fact that i'm getting things explained to me, i'd be in a hell of a state. From the feedback that i've seen so far some of the questions are fairly odd things to ask. Also with nav i've noticed that the whizz wheel answers can be slap bang in the middle of what i get.