The only issue i have in Nav is the cockpit stuff like diversions and im afraid my mental arithmetic is not as it should be. Like most have said i just need to practice in the armchair or FSX. I have the Oxford disk also. I think its more of a too much info.
Im on practical nav and i must have shown a weakness in this area my instructor has insisted that i complete this exam before im let loose for my solo nav - i understand why and agree with it.
Thanks all for your replies as ever a good place to find help. Thanks guys.