We've been using the SPOT Tracker each summer on the Lewis & Clark Trail in South Dakota for the past 4 years. although it has gotten much better since our first fundraising "Ride Across the Rez" in 2009, there are still many places on the reservations and along the Missouri River bottoms with no cell signal. The first and second generation SPOTs have a set ping rate for tracking, the Gen 3, as they call it, has an adjustable rate. I'm in a quandary as to whether I want a Garmin Edge Touring NAV GPS, or a SPOT Gen 3.
Since I have a old style SPOT that works fine, I will probably stick with that for now, because I really
want that new Garmin, and my birthday is only a couple weeks away!