Wish i kept my old gps units, first one was a Garmin GPS 3, bought for South America tours in 1997/8 and an Etrex Legend bought in the States for the Great Divide in 2002 as it had the mapping installed . They were not very efficient as the batteries did not last long and had the old serial connections.
Built in batteries , power banks and a solar panel are much better for touring today if you are out in the sticks for week or so.
Have ordered a GPSMAP 66sr , my Garmin 1000 is a disaster now , can't use the 3 button press fix if it locks up as the power button is dead. The only Garmin that has not given me grief was the GPSMAP60cxs so updated to the 66 model.