I do think a PLB is a good investment and I will be getting one for myself. As has been noted, cellphone coverage is still very patchy in NZ and one of the reasons why is that it is not cost-effective for the big Telco's to expand the number of towers for such small pockets of population. They can't recover their costs in many places. It is a problem the Govt. recognises and so do the Telco's and big businesses. It's just that NZ has so diverse a topography it would require hundreds of cell-towers that would never be covered cost-wise.
Satellite phones are very expensive, and the modern PLB's are very effective and cost efficient, I think, anyway.
You don't get to be an old dog without learning a few tricks.
Shorai Powersports batteries are very trick!
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