I think it's important to site the differences between this unit and a competitor "Spot" which lets you send nifty "I'm OK" messages. Spot is not a SAR 406 MHz Personal Locator Beacon. It is a GPS communicator. The Spot Communicator has been fraught with problems where tracking and personal messages have not been successfully sent.
Out of 91 users on REI's website 34 have complained that they have been unable to send messages. This works out to roughly 30% chance that your message didn't make it out. The statistics are even worse for the Spot Smartphone unit. Are these the kind of odds you want in a real emergency?
What I really want is a "Help, come get me" message that will work in the event that I am in an emergency. If I'm in trouble I want my message heard, and for that I'm going to rely on a SAR 406 Mhz beacon! This thing is lightweight and small, and it lets you test it once or twice a year to confirm that it's working. That's what the 12 messages are for, not for idle chit-chat with loved ones.
Yes, it's pricier than the competition at first glance, but there are no yearly subscription fees with this. You buy it once and it's good for years. With the spot you have to pay subscription fees at or over $100 a year. In the long run this ACR is much cheaper.
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