"If you are using Waze (other GPS systems are available) on a long journey, buy a lead ..."
Not necessarily true. If you have a more modern smartphone they will require a fairly sizable amount of power to keep an HD screen on, and many USB (not UPS!) ports don't deliver that much in a car, or don't deliver it consistently.
I tested this quite thoroughly over three cars, admittedly the latest car was 2016.
I found the cigar lighter socket usually gave more reliable oomph, but many cigar lighter accessories (to plug your USB port into) only ran at 1A, again insufficient for the more power-hungry phones.
Also with such phones, of course, your lead has to be up to the mark too.
So it's not always quite so simple as Duncan suggests...
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