IMO, the 770 is very reliable, but like anything else, it's simply another tool in our toolbox. Like anything else, it takes some time to master. I plan my route ahead of time and if not sure I plug in Google maps and check it. Google maps gives me a birds eye view of where and on what kinds of roads I'll be traveling. I also don't rely on street addresses. I pull up the GPS coordinates off Google Maps and use those. This method puts me in exactly the correct spot I want to be in when I get where I'm going. Finally, while Base Camp is helpful, it does take a lot of brain power to master. (I gave up :) YMMV).....Dennis