willbav8r, I think it is wrong to say that you WILL experience a lock up. I think it is right to say that you're more likely to with a PDA than with a Garmin GPS. Funnily enough I've had one with a Garmin GPS but never (in flight) with an iPAQ. But then I've used the Garmin more than the iPAQ, so it isn't that surprising. Having used both pretty extensively I have to say that personally I find a 196 better than an iPAQ with any of a different number of pieces of software. But if you want moving real CAA charts and you've already got a PDA and a GPS all you need is the software (cheap) and the cable (cheap) and you can have the best of both worlds - navigation data from the GPS and a moving map on the iPAQ.