I have an iPAQ 3870 and a Navman GPS jacket. I can't remember what model it is, possibly 3100 - http://www.fingertech.co.uk/gps_navman_3100.jpg Whenever I plug the GPS into the expansion slot it comes up with an error message (this error message will be posted in my pictures section of my profile). I tried to install the drivers supplied by Navman on this page but they do not work, I keep on getting the same error message. Also I have tried to format the Compact Flash card in the Navman jacket to make it readable but this doesn't solve the porblem. My battery went dead a few months ago and I lost everything, which caused me to lose the sat nav capabilities. Now I want to get it up and running again. The OS is PPC2003 if that helps. Any ideas? Cheers.