Stay connected anywhere2regardless of cell coverage! The SPOT 2 Satellite GPS Messenger provides a vital line of communication with friends and family when you want it, and emergency assistance when you need it. Using 100% satellite technology, SPOT 2 works virtually anywhere in the world. SOS911: Use this function in the event of a life threatening or other critical emergency. Will send distress signal if location cannot be calculated. Can also send nonemergency notifications to personal contacts. Check inOK feature allows you to let your friends and family know that all is OK with a pre programmed message along with your GPS location. With a push of a button a message is sent via email or SMS to up to 10 pre determined contacts and your waypoint is stored in your SPOT account for later reference. Custom Message feature allows you to let your friends and family receive a custom message along with your GPS location. Track Progress feature allows you to send and save your location and allow contacts to track your progress in near real time using Google Maps. With a SPOT account you have the ability to set up a SPOT Shared Page which allows you to show your SPOT GPS locations to others on a Google Map. Once activated, SPOT acquires and sends your GPS coordinates to your SPOT account automatically every 10 minutes for 24 hours or until canceled. SPOT performs a self test when you initially it on. SPOT needs a clear view of the sky to obtain a GPS signal and provide the most accurate location information. It is not reliable indoors, in a cave, or in very dense woods. Operating Altitude: 328 ft. to 21320 ft. 100m to 6500m.