Bought an Earthmate PN-60w in lieu of renting a sat phone for a recent Grand Canyon trip. Got tired of spending $ for poor sat phone coverage. This unit has the usual SOS plus you can send text messages to phones & email. Can't receive, but not much worth hearing when you're down there anyway. Worked great & the person you send an email to can zoom in on sat photo website to see exactly where you're at. The down side is being limited to a 41-space text, but can send unlimited #; every 20 minutes. Cost was $450 after rebate at Cabelas.....about the same as one time sat phone rental.