I suggest a professional cable such as available from Craggy Aero he http://www.craggyaero.com/cables_connection_kits.htm . These can connect your GPS - SN10 - PNA. Evan being a fairly proficient engineer, my decision to buy one of these was worth the money many times over. When GPS & PNA things aren't working correctly, it's nice to know it's not your home made cable, so you only have to figure out what menu setting you have wrong. If in doubt, call Richard.