[Boeing Guy]

I use a Garmin Aviation Gps, with road maps added. It have served me very well over the years.
There is one cavet with all of this though, the sat nav we all use and rely on is Navstar GPS, owned and looked after the United States of America's Department of Defence. As such they can alter the GPS signal and turn it off at will, this is something we in aviation like to remember, as you could find yourself stuck in the middle of nowhere. It is very reliable and as none of us live in any war zone it is unlikely that George dubbua will turn off the civiy signal or play with it but...... I was informed by Balpa (British Airline Pilots Association) that the MOD have been testing blocking GPS signals recently.
Still I wish mine taked to me