You only have to look at the absence of Bluetooth and WiFi support to see that the n35 is a navigation device first and a handheld second.

The iPhone 3G improves on its predecessor, refining its strengths and eliminating some of its flaws. On the way, however, it picked up a few more flaws. Exchange and MobileMe support are appealing, but poor battery life and substandard GPS implementation will deter some people.

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 S102 comes at a good price, but although the navigational experience was solid, it just doesn't do enough to command a glowing rapport. There are plenty of better options available on the market.

The P750 won’t turn many heads, but it will provide you with a fair list of features and the bundled window mount for navigation is a bonus.

If you can live without a slide out QWERTY keyboard, the D810 is an excellent option for those after a HSDPA smart phone. Sleek, stylish yet still packed with features, it comes highly recommended, although price is steep.

It's amazing that Dopod has managed to fit so many features into such a compact smartphone. You need to pay extra for mapping software, so the P800W is far from a cheap investment, but for some, the all-in-one convenience makes it worthwhile.

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.

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

This tiny handheld GPS receiver includes maps, intelligent routing algorithms, an intuitive display, and can be programmed with custom data sources or integrated into enterprise applications. Quest is a good alternative to more complex location-aware platforms.

The GPSmap 60CSx has all the hallmarks of a decent handheld GPS device. However, it still offers too little at too high a price.

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