I used the Garmin 62s when I did my 2016 tour and a Garmin Etrex Legend all the way back in 2005. You really can't go wrong with the 64 (modernized version of the 62). Just pop in 2 AA's and you're good for the day, no need to worry about recharging the unit via USB etc. Maps are free via OpenstreetMap which will do the job. If you want a slightly larger screen along with a touch screen, the Garmin Oregon 600's are reasonably priced now.