This is a trip to Germany last year taken with a Garmin eMap GPS, then the recorded tracks was imported to the Garmin PC software Mapsource with Worldmap loaded.

Flight path

The yellow line was made with the GPS being on for the duration of the westbound flight. The white line was eastbound and made from waypoints taken along the way, then joined in Mapasource. Histogram is the altitude of the aircraft during the westbound flight.

I have a Garmin eTrex Venture CX that has a battery life of 32 hours and a microSD card slot for maps. Now I carry this unit during traveling.