If you currently own a GO 720, then there is no real reason to upgrade, as most of the improvements are software upgrades. If you are looking for a high-end GPS with all of the latest features though, the GO 930 is excellent, if a little overpriced.

This is by far and away the best GPS unit on the market. It combines an excellent design with a fantastically easy to use menu system and features a whole range of extra offerings such as Bluetooth hands free, MP3 player and excellent text-to-speech technology. A must have.

A good GPS receiver, but the irritating audio notifications and lack of advanced customisation features mean this isn't the device to take on long drives.

There's no denying the convenience of having a combined PDA and GPS unit, but we have seen easier to use GPS units.

With an excellent map display, easy-to-use interface and clear audio instructions, the TomTom GO 300 has nearly all the features drivers need in a GPS system.

You only have to look at the absence of Bluetooth and WiFi support to see that the n35 is a navigation device first and a handheld second.

The GARMIN StreetPilot is a reliable and easy-to-use GPS unit.

If you can overlook the size and the rather basic entertainment features, this GPS does the job and for what it offers, the MMP-501 comes in at a very respectable price point compared with many other units on the market.

The nuvi 660 adds a larger display and Bluetooth hands-free calling to an already solid previous unit, but some small deficiencies still remain. Best of all though, the pricing difference between models is minimal, so the 660 is definitely worth the extra money.

The Navigator 7000 is outstanding for road safety thanks to its "Road Sense" subscription, but its navigational performance could be improved.

The RIDER 2nd edition offers several significant improvements over its pioneering predecessor, including a superior headset and bike mount. While a few flaws remain, it has managed to avoid most of the key obstacles that hamper other units.