Got a Bluetooth personal digital assistant with a 256MB memory card? This kit will turn in into a sat-nav system, if you have the patience to set everything up by linking the PDA to a PC and uploading software and map data from CD-ROMs. Then you have to get your handheld computer to talk to the puck antenna before you can plot a route. It's worth the hassle for Europe-wide trips, particularly as most PDAs come with large screens, giving clear maps.