I have an etrex legend and a Lowrance lcx28 hd. I want to transfer the waypoints to the Lowrance. I transfered the info from a navionics hot map cd to an SD card. I hook up the data cable from my etrex to my pc so I can transfer the waypoints to the same card, but it seems as though my computer cant even tell the etrex is hooked up. I have the etrex in the interface mode and have it scrolled to Garmin. Any ideas why my Pc is having trouble reading it?