I live on the Coastal Plains (read that as FLAT) southwest of Houston a little ways (read that as lots of cell phones in the area). 10 miles from home I can lose service for 20 miles or more. You'd think it couldn't happen, but it does. A cell phon eis iffy, a tracking device, even if it should somehow lose triangulation, will show the last "visible" place you were and what direction you were heading. I see it as a real good thing. Now, do I have one.... No, I do not. Perhaps someday I will though. It seems like a good thing if it were just a little less expensive.