Re: Gnav
BP,
If you mean the Gnav Vortrack system, I use it and think it's brilliant! You simply place a stud through the VOR you want to use, and then clip the arm onto it. Tune in the VOR, ident it, and then pick up the radial plus the DME - turn the arm to radial and then find the distance, and hey presto, a damn accurate position fix. It saves the hassle of having to use two VOR's etc.
My only gripe would be that they don't give you enough of the plastic stuff to do more than 12 VOR's, and if you change your map everytime the CAA updates it, you either end up buying more of these, or carefully removing and reapplying - I've managed this once, not sure if I'll get away with it again!
DW