re: pings...i never understood them but after the discussion of edgemont i thought i'd take a looksee.
IMO, the phone last pinged at that picnic area. and that's why they chose it as a meeting ground (and as per all9ofus's local expertise that this was the best possible locale for 300 people). my guess, my theory, my assumption only...based on the following, snipped and BBM:
http://pursuitmag.com/locating-mobile-phones-through-pinging-and-triangulation/
"With the
older style analog cellular phones and digital mobile phones that are not GPS capable the cellular network provider can determine where the phone is to within a hundred feet or so using “triangulation” because
at any one time, the phone is usually able to communicate with more than one of the aerial arrays provided by the phone network. The cell towers are typically 6 to 12 miles apart (less in cities) and a phone is
usually within range of at least three of them. By comparing the signal strength and time lag for the phone’s carrier signal to reach at each tower, the network provider can triangulate the phone’s approximate position."
now, look at a map of the three closest towers to where florida road and 234 intersect:
http://www.cellreception.com/towers/towers.php?city=durango&state_abr=co
(sba II, winton, towerco) it's a near-perfect triangulation of where, possibly, his last text to RN pinged from. while the phone was still on.
just my opinion and thought.