GPS
THe Garmin 100 has been around for a few years and are appearing on the secondhand market for less than £200.
A terrific piece of kit - no moving map or database but kids stuff to programme/ use. These were quite expensive new.
Mine got me to Stockholm and back the other week.
THe Pilot 3 is incredible value - I have just bought one to stick in my pocket if my map blows out of my open cockpit plane.
They do make you lazy - I make a point of not using mine occasionaly ( usually when I am staying in the circuit...!)
So - if you want new - Pilot 3. If you can find a 100 - go for that and spend the change on flying.