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.

The FD-250 has most of the basics and a few extra features that will serve you well, but the lack of responsiveness of the touch screen is an issue.

Although the eTrex H might suit those hikers who want nothing except the bare minimum, most will find it largely unusable. Inadequate functionality and no base map makes the unit extremely hard to use for anyone except the most experienced hikers, and the slightly more expensive Magellan Triton 200 is probably a better option.

The EVO is a welcome driving companion and, although not perfect, works well for providing early warning of safety hazards.

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.

The latest edition ONE features an even smaller design and an EasyPort mount, and supports TomTom’s Map Share feature. The ONE continues to set the standard for other GPS units to strive for.

The S30 is an ideal GPS unit for those on a budget. The entry level unit combines a stylish design with good maps, a reasonable feature set and a very competitive price.

The ONE 3rd Edition adds an excellent safety feature to an already outstanding unit, though it's a shame battery life hasn't been improved. Regardless, it's definitely great value at this price.