When I drive, I have a share location function on my phone so my wife can keep an eye on my movement. If it stops for too long she will text (as I sometimes stop for a nap or stretch my legs etc) Usually if I am stoppng for more than a few minutes, I will text her anyway as I dont check my phone while driving...
Obviously this only works where you get reception, but even if it is patchy, it will give you a last known location that may help...
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