I just carry a regular PLB and always keep in mind what a local SAR tech mentioned to a group of us recently:

"Regardless of what PLB / SPOT device you use. If you push the button, SAR is alerted. We now have your coordinates and if you stay put, we will find and come to your rescue even if there is no other info forthcoming after the initial alert."

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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock