Garmin Montana 650 car navigation problem in GPS technology and devices Posted October 7, 2012 Has the problem been fixed? Any new information on the issue? I can't find too much else on the issue other than this forum thread. I bought a Montana 600 about half a year ago and I started to experience exactly the same problem as you describe during the last month or two. In the beginning it worked perfectly. I did not notice after which firmware update that started. Now I have v4.60 and it is having the problem almost all the time. I just tried factory reset on the device and need to go out and try if it helps.