We gave the Wayfinder Navigator navigation software a try with two well-known devices: the Apple iPhone 3G and the Nokia N82.

The latter is a Symbian S60 handset and our experience of using the Wayfinder Navigator on the N82 should be matched on the Nokia N95 and other S60 handsets (see system requirements for details).

Note that you need to be on a 3G or GPRS/Edge connection - you can't simply use a WAP service to get online and start using the Wayfinder Navigator service. This is important, as otherwise you'll be unable to configure the satellite navigation service. It's worth looking into handset compatibility at MyWayfinder.com before you fork out for the Bluetooth dongle needed to add GPS navigation to your phone.

Assuming you can negotiate the compatibility and connectivity hoops and have charged up the BT Bluetooth dongle, you're all set to start GPS navigation. We found we had to delve into the Applications folder on our N82, where a green heart icon indicated the Wayfinder Navigator program was installed.

This same motif is used to indicate the current location, while we were pleased to find that the Wayfinder Navigator's satellite strength indicator is a fairly prominent cartoon-style icon displayed at the top left.

Route calculation can be from A to B, from where you are now to a specific location, extracted from a saved list of favourite routes, from the results of a search you've performed - useful if you don't know an address and basically want to find a shop, a specific service or a hotel and then to drive straight there. With Wayfinder Navigator such searches can either be highly specific or ‘in or close to' a location. In practice, our tests of this particular function didn't prove that fruitful - at least in congested central London where the GPS signal strength wasn't that strong.

In common with most satnav devices, the Wayfinder Navigator uses TeleAtlas maps. Rather than being static information, the mapping information is stored on a server, updated regularly and pushed to users' handsets. As such, road blockages and new road layouts can be accommodated without the user having to manually update the maps by visiting the satnav company's portal or paying for a new quarter's map updates.

Wayfinder has been sensible in its choice of the handsets Wayfinder Navigator supports - the Nokias, BlackBerry and iPhones of this world all have bright, colourful and relatively large screens. When the idea of satnav on phones was first mooted, it was often on handsets with very small screens. For all intents and purposes, you had to be content with using such maps to point the way, rather than for turn by turn navigation as you cycle or drive.

NEXT PAGE: the interface, down sides and our expert verdict