Jules
Like Mark & Chris, I like/use Memory Map on a PDA, works well, via a bluetooth GPS unit,
How useful on challenge events, I do not know, but place like seven sisters etc, where everywhere looks the same !! position via MM and being able to see where you have been (track) certainly helps
But, I have this week gone down the tablet toughtbook PC route, for a number of reasons, mainly needed a helm position charterplotter on the boat, rather than fitting another dedicated marine plotter (Raymarine etc) gone toughtbook PC, so have loaded a charting system, also have memory map loaded so can be used for land use , as well as having mobile internet access,
Also, if you got the chartplotter route, you need to check who's charting system they use, to make sure they do a land mapping system as well, i see the garmin as below use they own ,,"Garmin’s BlueChart® cartography"
Chris, re touch screen, I thought that's what I wanted, but after trying one, went for the pointing digitizer pen type, more accurate, and you can rest you hand on the screen, without creating errors
Re tripmeters, on the rally cars, have always preferred the Brantz units, much easier to calibrate,