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Are sat navs supposed to be plugged into the cigarette lighter socket whilst in use?

Posted 28th Jun 2013
I've researched online, and some people say they are supposed to be plugged in when in use, so I'm confused at the moment.
Also are there any advantages/disadvantages to having it plugged in all the time (whilst in use)?

Sorry if the question is a bit dumb and/or obvious.

Thanks in advance
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