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One thing I do find very very useful with satnavs is that you can take detours to anything that seems interesting and the satnav app will quickly tell you how to continue.
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... or maybe not.
I remember driving in the centre of Grenada, Spain, needing to go across town to my hotel. Tom Tom directed me up the main drag, which seemed sensible; everything else was a maze of narrow backstreets. However what Tom nor I knew was that the main drag had recently been turned into a bus/taxi only street, wih bunches of enforcement cameras.
So I turned off, looking for an alternative route, but the damn thing just kept leading me back to the bus route, every other way being longer in time and length. I could hear it saying "Can't you follow directions, dumb cough?"
There was no way I could navigate myself off the direct route due to the narrow, one way streets, so after 4 diversion attempts, I just bit the bullet and drove up the bus route, cameras be damned.
A couple of months later, several traffic tickets arrived home via Avis. I figured the Spanish system probably couldn't cope with chasing things overseas, and I was right.
Mind you, I probably gave the Tom Tom a breakdown earlier in the trip. It hadn't caught up with the frenzy of new Spanish freeways in western Spain, so saw me hurtling through fields and other rustic locals and was desperately trying to get me to exit to many small local roads that I 'crossed'. I 've never heard a satnav beg before