Unfortunately, I haven't had mine turned on for a few weeks, so you can't see the tracks at the moment.
SPOT works very well around here unlike other tracking devices that use cellphone (TDMA, GSM, etc.) technology to report current location information. You don't necessarily need to have a cellphone, it's just that these devices use the same technology. Which means no signal, no reporting.
Instead of relying on cellphone reception to report location, SPOT uses the same satellites as the GPS units use to determine location, but then reports the location (every 10 min. w/subscription or manually by pressing the "OK" button) by using the satellite phone system (Globalstar, etc.). This means that as long as you have a fairly decent view of the sky, you should be able to report your location. When you press "911" the unit also sends out a directional "beacon" that emergency and rescue personnel can use to find you.
Batteries last about a year with normal use.
Other buttons - "Help" for non-critical emergency needs, and "911" that will deploy rescue personnel to your location (included in subscription, but you pay for false alarms).
You can also send both "OK" and "Help" messages to your friends and family by e-mail or txt. You can set up a public map that allows anyone with the link to follow you on the internet, which is what my family does when I'm out geocaching, hiking, or traveling (see Jumpin' Jack's post).
SPOT is a bit expensive, about $100 for the device, and somewhere around $150/year for the subscription.
If you have a cellphone with built in GPS, you can also use Instamapper
http://www.instamapper.com/ext?key=11998469737861398887 to keep up with your location and report to others. You'd still have to call 911 in an emergency.
