Duckkiller, Send a PM or email to canepole here on crappie.com. He runs Garmin and Humminbird, plus he's an electronics wizard. He would know if anyone. I have a Humminbird PC cable and a Garmin PC cable for my 498C. My computer also has Mapsource and the Humminbird computer program. Do you have a datacard for your Garmin handheld? I'm going to be at Ingram's Marina Lake Talquin cabin #2 this Friday afternoon. I could bring my laptop computer and cables with me if you need them to do the transfer. Get back to me by tomorrow evening as I'm hitting the road 4:30AM Thursday.