I use my HP IPAQ rx3715 which has a camera build in, together with my external Bluetooth GPS, to "tag" the photos with the GPS coordinates. To do this, I snap the photo wih my Ipaq PDA, start the Bluetooth GPS, and use on the PDA the Navio GPS software. The Navio GPS Program displays the GPS LON/LAT data and he Date/Time on the PDA's 'Today Screen'. On the PDA Today screen setup, I select the photo which want to Tag as the background photo and with the screen capture program I capture the Today Screen Background Photo, which now has the GPS data displayed on the photo. All this takes only seconds and is done without using a PC. However I am looking forward to try Sony's GPS-CS1 with my other camera as soon as it becomes available.