Putting GPS on to mobile phones is this year's thing, but few yet have satnav as a built-in function. The others require a separate Bluetooth receiver. Thankfully, Telenav's black and silver adaptor is a classy-looking piece of kit (especially compared to some of its less well-bred rivals).
You get good clear maps that you can easily zoom in and out from by pressing a number on the keypad. We also liked being able to leap to a location and have Telenav guide you there by clicking on a contact in your BlackBerry address book – as long as you've stored their home or office address, of course. There's a useful separate option to locate and get directions to an airport, too.
Other aspects, such as tracking down your current location, can take some time – a complaint we also had with Nokia's Navigator. Obviously, if you're lost, you've all the time in the world, but it's not necessarily the shortcut to getting directions from A to B that you may think. It's quicker to type in an address or a business using the Biz Finder.
Pedestrians can make use of the compass and waypoints. Detail can be sketchy when you zoom in fully, but they're a useful adjunct to the street maps given that you're as likely to be wandering foreign parts in your stilettos as in your hire car.
For reviews of more than 20 brand-new satnav kits - dashboard, mobile phone and PDA kits included - click here.