The zumo 550 is without doubt an excellent option if you need a GPS unit for your motorcycle or scooter.

Freedom's mini GPS is a solid GPS receiver in a compact package that works with most hardware and software combinations.

If you want a fully fledged GPS navigator, you are best off purchasing either a portable in-car unit or a handheld device with a larger screen. If you want to track your fitness data, then the HGE-100 may be worth a look.

A sleek, slim design combined with the latest in features including the ability to transmit sound via a built-in FM transmitter, the compact nuvi 760 is definitely a winner.

The R600 is a solid, but not outstanding GPS unit. Its large display and simple user interface are positives, but the large, bulky size, combined with a lack of text-to-speech technology are downsides.

The AVN2210p is far from perfect, but it's a nice example of what can be achieved by combining personal navigation and in-car entertainment. It's a very solid unit with a couple of nifty features and the fact that the GPS unit is detachable will be a selling point for many consumers – not to mention its very reasonable asking price.

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.