I own a trucking company and track 10 of my trucks with Nextel (now
Sprint ) phones in partnership with a service named Xora. It takes a
public IP and the correct software in the phones. Each phone is
recieving GPS signals and connects every 10 minutes to the Xora web
site and transmits it's lat/long. I access the web site and select the
driver/phone and can view his movements that are recorded (every 10
min) and overlayed on to a detailed road map that gives his location
within probably 100 ft. I can bread crumb his movements up to about 24
hours broke dovn into 10 min. incruments on a map that can be zoomed in
or out. If he's on the cell phone it will only give me the location of
the cell site his phone is talking through. When he's out of range of
a cell site it will record his lat/long every 10 min. and when he get's
back into range of a cell it will relay his positions recorded. I can
ping the selected phone manualy about every minute or so and get a more
detailed track. The only info I can get out of this is position,
speed and time, no altitude. The map is not of topographical nature so
when I've looked at my track on the Whites or Sierras it's not near as
useful to me as a flight recorder as Win Pilot, See You or even the
Cambridge programes when linked to a real GPS flight recorder.

The information I get from the phones is invaluable, no more bull
****ting about where they were or are, I know how long they stop and
where. And very useful when my customers call up asking where their
load is. In my opinon not worth tracking a glider with though. This
service costs me about $26 per phone per month plus the cell service
fees.
Russ