The BT-Q818 boasts a fantastic battery life and speedy GPS performance, so it's an ideal receiver for the relatively inexpensive asking price.

If your mobile phone or PDA doesn't have a GPS receiver built-in, then the stylish and compact LD-4W is definitely worth a look.

Magellan's CrossoverGPS unit is a fair effort, but it's lacking in some areas. If you do your fair share of walking and boating though, this is definitely worth a look.

The C320 is very similar to the successful C520, minus a couple of features. It represents great value for money at this price point and is ideal for first time users, or those who just want a GPS unit without extra bells and whistles like Bluetooth and multimedia functions.

The C720t is very similar to the successful C520, so it remains a great unit with plenty of features. Unfortunately, the geotagging feature is poorly implemented, so we're not convinced this is worth the extra cost over its little brother, though the included TMC cradle kit is ideal if you are planning to use the traffic feature.

The GO 720 is another fine unit from TomTom. It features a slim design, great maps and navigational performance, Bluetooth for handsfree calling and some great safety features.

HTC's TyTN II is one of the most outstanding smartphones we've ever reviewed. A few minor improvements and this could well have been a five-star product.

For those who like the idea of practically carrying a mini-notebook in their pocket, the E90 Communicator is one of the most comprehensive available. It won't appeal to everyone but despite the lack of TV-out and fax features, it is the best of business phones.

The nuvi 250 is a solid unit and commands a lower price than the 250W, despite possessing the same features.

The nuvi 250W is a solid unit and the widescreen display is certainly a nice touch for an entry-level model, but its missing a few features to warrant its price tag.

The S90i is Navman's cream of the crop, and it is certainly a fine unit. The 2-megapixel camera adds flexibility for using NavPix.

The S80 is the third product in Navman's S-Series range and introduces text-to-speech technology to an otherwise largely similar unit to the S50.