There's an icon for the Tracker app on my Nav V so I gave it a try, without success. A phone call to Garmin's support dept. was interesting in that they couldn't get Tracker to work either - so they "opened a case" and advised me not to expect immediate results. (My setup: iPhone 5s, Nav V, Smartlink subscribed). I've been happy with the tracking feature on my SPOT device and am thinking the Tracker app could serve a similar purpose in cell areas at least. Has anyone already succeeded in using this specific app?