The Spot, the world’s first satellite messenger, allows others to track your movements with a link to Google maps. It also allows you to ping your family to periodically send out an “I’m okay” signal, or alternately, a 911 call. And, it works for 14 days without a battery charge, it’s waterproof, and weighs only 7oz.
It’s not a satellite phone so doesn’t come with unaffordable charges — it’s only $99 per year for the service. $170 from FindMeSpot.com.