Removing the nav is slightly more tricky, depending on the angle of your windscreen, because you have to reach behind the device to undo the locking ring. It's very easy to affix to the windscreen, it's just a matter of pushing the mount against the glass and rotating the locking ring. The Go Essential (left) has a capacitive screen while the Go Basic ( right) features a resistive screen In reality, it's a bit less than the advertised hour. Once fully charged, it lasts a claimed one hour without being plugged in. It also means we can play around with the settings and get to grips with the nav inside rather than sitting in our car to use the 12v socket. We like that the sat nav comes with the option for charging via a USB port or the 12v socket as we often have a mobile phone and/or dash cam plugged in as well. In the box, there's a reversible adhesive mount, a 12v in-car charger, USB cable and user guide. The Go Basic doesn't get the six months of speed camera updates (it gets three instead), hands-free calling and compatibility with Siri and Google Now - but do we still think it's a good buy, especially when smartphone apps like Waze offer free real-time navigation? What's it like? While there's £30 between the retail prices of the Go Basic (£150) and the higher-spec Go Essential sat nav (£180), we regularly see the Basic at about £120 and the Essential at £160 on Amazon.

We're reviewing the 5-inch screen model, although there's is also a 6-inch screen variant.

TomTom's Go Basic is, as the name suggests, the base-spec model in its sat nav range - offering lifetime traffic services and lifetime European map updates, smartphone connectivity and a three-month speed camera subscription (before you need to start paying for this feature).

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