I sometimes leave my basic Garmin walker type GPS on when flying - the track imports nicely into memory map.
DH, I have a basic Garmin outdoor type GPS as well (the yellow eTrex Euro, the first of the eTrex series) and combined with the appropriate serial or USB cable and OziExplorer, with the VFR maps I scanned and calibrated myself, it makes for a really useful bit of kit while flying. Just like the fancy aviation GPSs, you put the route in and follow the magenta line (well, black line in my case since the display is monochrome).
To be used as a backup for other types of navigation of course.