Satellite navigation systems

1] TomTom Go 720 £330
It's the moment you throw your sat-nav straight out the window: you're lost, and the blasted thing suddenly suggests you turn left, the wrong way down a one-way street.  The Tom Tom Go 720 has a solution. Its flexible software allows users to upload their changes to map glitches, which fellow users can then download. It's sat-nav for social networkers.  A winner.
www.tomtomgo.co.uk

2] Navman S90i £299
Navman devices have a reputation for added extras that don't really add that much extra. The latest range offers a similar story. The S90i's text-to-speech function, when it works, is a useful addition, speaking the street names to you before you reach them, but why you'd want to use the device's in-built camera to photograph your favourite destinations is anyone's guess.  Random innovation aside, this is a well-designed, easy to use machine at an affordable price. www.navman.com

3] Garmin Colorado 300 £399
A rugged, hard-wearing and waterproof little number, this is a sat-nav to get you back down off the mountain safely. The Colorado is equally at home directing you to the local shops, but we prefer to think of users up to their necks in mud on a cold, windy hillside.
www.garmin.co.uk

4] Ndrive G400 around £150
This budget device comes with a built-in drink-drive detector. Just breathe into the side-valve after that  longer-than-expected business lunch. It may not have  the best user interface, but the G400 just might save you from losing your license. Mind you, if you're asking a machine's advice, you're probably better off in a taxi. www.ndriveweb.com

5] Mio C520t £265
The most powerful sat-navs are only as good as their software. Handily, the C520t comes fully loaded with as many European street maps as you'll ever need. A large, detailed screen provides timely information-and helps you pinpoint useful landmarks, such as petrol stations-but as with many rival systems, the traffic avoidance function still needs some fine-tuning. This is also no device for the fat fingered.
www.mio-tech.be

6] RAC Satnav 220 £299
As brand extensions go, it doesn't seem too much of a departure for the RAC to hit the sat-nav market. Although it's none too portable, the 220's huge, five-inch screen makes for easy reading, even when your eyes are fixed on the road ahead. A column on the right delivers all the vital information, such as distance to the next turn. 
www.rac.co.uk