Thanks X5 Monkey and UCrew. I fear that my issue is more severe than anything that I can do, so the Dealer has scheduled a tech to look at it on 7/18. The issue occurs only about 30 - 40% of the time that I'm driving. The rest of the time it shows me in the correct position. When it shows that I'm in the wrong position those little green dots are no different than when it shows me correctly. Today I turned onto a highway and headed South, but the NAV system showed me as heading West from the point I turned South for about 3 miles. The NAV system showed me driving through areas with no roads, across reservoirs, and ultimately linked up with me again as I exited the 3-mile stretch of highway I was on. I'll update you all after the 18th. Thanks again.