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

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.

If you spend a lot of time driving around unfamiliar areas by yourself, the iQue M5 could be a substantial time saver. It is well-built and easy-to-use, but a little pricey.

If you're on the lookout for a smaller and simple to use GPS, the Streetpilot i3 would be ideal. More advanced users will be frustrated by the limited control set and slow calculation speeds.

If you are after a compact and simple GPS system, then the nuvi 300 should fit the bill. Overall, a solid navigational experience on the whole is enough to cover for some small deficiencies.

The nuvi 660 adds a larger display and Bluetooth hands-free calling to an already solid previous unit, but some small deficiencies still remain. Best of all though, the pricing difference between models is minimal, so the 660 is definitely worth the extra money.

The StreetPilot c510 is a solid budget offering, and has a few features that are usually reserved for more expensive models.

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.