Offgrid phone Vs. dedicated sat nav GPS unit ?

Hi, what's best ? Assuming I'd use openstreetmap on either.

At first thought I'd have said the satnav,

* because it only receive broadcasts from satellites and sends nothing
* because it never looses signal (dot/arrow position on the offline map) compared to phones that rely on cell towers (i.e data/3G/4G coverage)

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1. However from a security point of view, I doubt satnavs even have the basic feature of password screen locking (and overall/SD card encryption), while storing all …

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