TomTom Go 910 satnav

TomTom takes the art of satellite navigation to a new level.

How do you improve on an outstanding range of satnavs? TomTom believes that by giving its latest device a wide four-inch touchscreen and 20GB hard disk it'll blow the rest away. It's not wrong.

The GO 910's design is unmistakably TomTom. It's bland, but it does the job. Although it boasts a larger screen than its predecessor the GO 700, the unit is actually smaller overall. That's pretty amazing when you consider it's housing a 20GB hard disk, of which 8GB is taken up by maps of Europe, America and Canada. That leaves 12GB for your pics and MP3s - which are easily accessed via the TomTom HOME software.

Always looking for improvements, TomTom has also redesigned its suction mount. Gone is the lever, now just hold the sucker in place and twist the rotating disc to increase suction. There are also a number of connectors on the mount -for an external aerial, a 12V adapter, a TMC receiver, a mic and an audio out. You can buy a cable that lets you control your iPod via the touchscreen. But you also need to connect it to the car stereo, as the inbuilt loudspeaker is no good for music.

This picks up satellites with ease - it took us just under 30 seconds. But the main improvement in use is the addition of text-to-speech, so the navigator reads out full road names instead of just advising you to "turn right".

You can still connect to your mobile via Bluetooth for hands-free use, and the PLUS service gives you yet more options, from traffic alerts (£40 per year) to safety camera updates (£20 per year). Add a USB dock for connecting to PC or MAC, and you'll struggle to find a better satnav.

Oh, and did we mention it's £50 less than a Go 700? A must-have.