Very interesting.... I used my Garmin GPS12 for several years in a PA28, and very useful it was. The machine we now use has Garmin radio/GPSs fitted, so the hand held one stays at home. I also have an amateur radio licence, so appreciate the comments about spurious signals being radiated - my pc flattens parts of the HF spectrum - so perhaps an A5 sized atlas and a bit of research before hand might make the journey more interesting! Dare I use my calculator to help with the maths?? Thanks for all your comments....