Best removebale sat nav?

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I already have a device which is a few years old made by Pioneer. It looks quite good, is very compact and can be moved from car to car. Unfortunately inputting the post code search is an extremely slow process, as it stops and thinks after every single letter is pressed! It can sometimes take over a minute just to enter the postcode and fails a lot.

So... please recommend a removable satnav with ultra fast post code input...

Thanks!

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As long as it's very fast to input a full postcode without processing delays?

I also notice some of the new models allow voice input.