KCDW
Consider also the Bendix-King Skymap 2 (available from
www.gps.co.uk among others) - this is arguably the best for strapping to one's leg which is the only available option for many self fly hire pilots.
It doesn't have a built-in aerial but you do NOT want one of those - the suction cup window-attached one is 100% reliable.
I've had this unit for 3 yrs and it's great. 4 hours battery life and no bugs that I ever found. I update the database once a year.
I have to say I am disappointed at the lack of tech progress in aviation GPSs - one could build in a much higher resolution screen for example. This leads one to a PDA-based solution, usually based on a Compaq IPAQ and there are a few of those about. But they aren't anywhere near as rugged.