The i780 improves the usability of an otherwise regular Windows Mobile 6 device by offering a redesigned home screen and an optical joystick.

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.

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

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.

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 larger screen enhances an already enticing package. The N60i is an excellent GPS, with a great user interface and quality maps.

There have been some good improvements to the Mio A702 over its predecessor, the A701, and while the navigation wasn't overly effective, it is a hybrid device and can't be expected to do everything perfectly.

The Treo Pro is Palm’s most stylish smartphone yet. Good looks, ease of use and the latest features make this a well-rounded choice.

Despite the N82's tiny keypad and questionable all-plastic design, it remains a solid handset boasting a long list of features.

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

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.