Filed under: Gadling Gear Review Today I'm going to give you a closer look at a gadget that isn't just fun to play with, it's something that could actually help save your life. The SPOT satellite messenger is part GPS receiver and part satellite locator beacon. The device receives your location from GPS satellites and relays it through even more satellites back to ground stations. It all sounds horribly complicated, but the SPOT messenger couldn't be easier to operate. The device is about the size of a small digital camera and only has 4 buttons (help, on/off, OK, 911). Naturally the on/off button is for powering the device on or off. The OK button sends an email or text message to a predetermined recipient (as well as activating the tracking feature) and the help button sends a "help me" signal with a personalized message to people you have added to your SPOT account. And finally, the 911 button actually alerts a global rescue organization that you are in trouble and need immediate assistance. This emergency assistance is provided by the GEOS Alliance , an organization underwritten in London which provides search and rescue services. SPOT accounts optionally include up to $100,000 coverage per year for rescue resources (including helicopter, aircraft and private search teams). When GEOS receives an alert message, they will first try to contact you and your emergency contact numbers. By holding down the 911 button for 3 seconds, ...