A pocket sized tracking and SOS device from SPOT, updated and enhanced in this latest version. It’s easy to track, send preset messages, request assistance or trigger an SOS. Tracking options include Unlimited (10-60 min intervals), Extreme (every 2.5 mins) and Motion Activated. The battery life is good (3-52 days) and has the advantage that it will accept AAA Lithium ion batteries or NiMH rechargables – or a remote USB power source. Spot uses commercial Globalstar Satellites. These don’t have global coverage, and can be iffy when there isn’t a clear view of the sky (under cliffs, in forests). If you want a bombproof SOS function and nothing more a simple PLB such as Fastfind may be best (uses the COSPAS SARSAT system of SAR satellites). However, for enhanced features such as tracking, basic messaging as well as SOS, The SPOT Gen3 is a user friendly and intuitive system in a very lightweight unit (116g inc batteries).