I recently experienced something very strange with my etrex vista. I am based in the US and recently visited the UK. Prior to traveling I used my vista to go geocaching and retrieve a travel bug to take with me to England. The unit worked just fine. While in the UK my vista would shut itself off when I tried to select the navigation page. Every other page worked just fine. I could see my waypoints on the map page which is ultimately what I had to use to find my geocaches. I tried selecting the navigation page by doing a go to, by using the click stick and by using the pages button. Every time the navigation page was selected the unit immediately shut itself off. I tried removing the batteries and restarting but then I couldn’t recalibrate the compass since it is on the navigation page. My vista is about 7 years old running software version 3.80 which is the latest for this unit. And now that I am back in the US, the unit is working perfectly!! No problem going to the navigation screen. Garmin tech support was unable to explain this. Has anyone else experienced anything similar?