You ask/you answer: Are sat-navs really necesarry?
 

"When I need to, I strap a knackered old map to my tank to get me from A to B. My friends all seem to use sat-navs but I don’t see the point. They are hugely expensive and fiddly, having to attach and detach them after every use must be irritating. Are there really any benefits that my trusty map ...

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