I haven't seen nor heard of this but I am not a SAR person either. One major drawback of this appears to be that you need wifi or 3G data access for many functions. This type of coverage is not always available for many SAR teams once they get out of the urban areas.
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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