Sony Clie N series
This review is based on a sony Clie PEG-N770C/U. The Sony Clie N series is a low spec PDA which runs the Palm OS. The Sony Clie N series has no inbuilt GPS reciever or CF card slot. However it can plug in to an external GPS receiver such as the Haicom HI-203E. The GPS receiver needs to be powered, and the Haicom comes with a combined cable which connects the PDA, the receiver, and plugs into a car lighter socket to power the receiver and the PDA. (If you are adept with a soldering iron, you could also make a portable battery-powered adapter).