Costing the same as a low-end automotive GPS unit, the Triton 200 forgoes a touch screen as well as turn-by-turn and voice navigation in order to specialise in detailed mapping for outdoor activities. However, without the expandable memory required for detailed maps, the Triton 200 doesn’t provide the functionality necessary for more complex hiking and geocaching adventures.

While not as visually appealing or easy to use as other GPS unit we have reviewed, the GPS on the 169 did its job. The PDA however, lacks Bluetooth and Wi-Fi support.

The C220 is a solid choice if you're after an entry-level GPS unit. Excellent maps, speedy performance and a competitive price may be enough to overlook the sometimes confusing interface.

A good GPS receiver, but the irritating audio notifications and lack of advanced customisation features mean this isn't the device to take on long drives.

A massive improvement over earlier MIO models, the C510 includes good maps, clear voice instructions and added features like Bluetooth hands free.

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 compact size of this unit doesn't compensate for its poor GPS performance. Not recommended.

There have been some good improvements to the Mio A702 over its predecessor, the A701, and while the navigation wasn't overly effective, it is a hybrid device and can't be expected to do everything perfectly.

Without a doubt the best GPS unit Mio has ever released, the C520's delightful widescreen display, split-screen technology and text-to-speech navigation makes this one of the best units we've reviewed.