There are plenty of options for satellite navigation on your mobile phone ( Alk Copilot 6 , Route66 etc.) but, as well as being expensive, they all require you to carry around a Bluetooth GPS receiver that needs to be recharged along with your phone.

If you're trying to get from A to B but know your immediate location, Map24 Mobile is a decent alternative.

Compatible with Pocket PCs and the majority of smartphones, Map24 Mobile is a free service and can be downloaded from the Map24 website . It does, however, require internet access via your phone, so you'll be at the mercy of your network operator's data charges. A handy data counter can be displayed on screen to help keep track of your charges.

We tested it out on a Nokia N70 and, despite the small screen size, the map was very clear and easy to read. Working in much the same way as Map24's web service, you can fly over the map, zooming in and out at will.

Although getting to grips with the controls takes a while, the map itself scrolls extremely smoothly. It's also possible to route from one point to another; you then scroll down through the written directions with the map, updating on each button press.

Map24 Mobile is a useful application to have on your phone and works extremely well. The fact that the application is free is a bonus, but in just a few minutes we managed to rack up a data transfer of around 150Kb; use it for extended periods of time and you'll find a nasty surprise waiting for you in your next mobile phone bill.

Also consider:
Alk Copilot Live 6
A good sat-nav option for mobiles that has some interesting features