That's what I got as well: ACR ResQLink -- you register it with NOAA every 2 years, I can't find anywhere listing the price, I think it's $50 or $75. It then talks to NOAA satellites to send out your distress call and location. The device itself when I got it was $250, looks like they are $350ish now.
The downside is there is basically nothing other than "I need rescue" that you can do with the device. You turn it on and a rescue team shows up.