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.

This is an extremely comprehensive system with some high-end GPS features, most notably the 3D Gyro Sensor, but the AVIC-HD3 offers so much more. If you're purely after a GPS device this is more than you'll need. However, if you're after a fully integrated car system with GPS, the Pioneer AVID-HD3 is worth looking further into.

The BT-Q1000 does what it claims: it'll track your movements very accurately, as well as record places of interest at the press of a button, and map them on Google Earth. It can also be used for navigation when paired with a PDA or notebook computer and GPS software. However, its software interface will confuse the uninitiated.

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.

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.