We use the Garmin Etrex 20 gps. Runs on two AA batteries with 18-20 hours. Rechargeable batteries or standard. Worked flawlessly in Portugal, Ireland and Europe. Download the free maps from Garmin openstreetmap. Plan your route on Basecamp and away you go. A bit of a learning curve, but well worth it in my estimation. We also bring along a phone, but rely solely on the gps for travel purposes.