I'm not sure if it'll solve all the problems, but there's also the "Emergency+" app for various phones. This gives location data if you've got GPS, as well as trying to work out nearest cross street, etc.. This might work better for "remote" locations, especially if there's a bit of confusion about the naming (is it Arapiles or Djurite? Do you need to tell them Arapiles-Tooan State Park?).
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