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.