Re: GPS and cell phone on a 6 volt system
On my road trips if I ever want a GPS (which is rare as GPS has lead me astray when a plain old map was better) I use a 10" laptop with MS Streets and Trips on it and an external magnetic GPS receiver on a wire to the outside cowl or roof. Of course it's a huge display compared to the self contained GPS and the computer's battery will last 6 hours which is more than I ever need of GPS in a day. Still prefer the good old road map though.
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Prof. Henry (The Roaming Gnome) 
"It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness
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