If you're only doing one nighters I wouldn't bother with messaging. most folks I know who use that use it for weather updates or progress reports on longer trips.
A PLB is a must, if I'm going anywhere that cell reception is a bit iffy, even if I'm in the car then its on my belt. my grandfather died down the back of his farm when he had a heart attack and couldn't make it back to reception to ring for help.
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