After many tests I realize that I have purchased the wrong device. Even when immobilized, the heading output varies within a range of about 5 degrees, continuously. This cannot drive an autopilot, independently from the issue of the update frequency. I realize now that I have purchased the wrong product, because for my purcpose I should have purchased your other product: Quark-Elec AS08 This product will be more than perfect for driving my Raymarine smartpilot. I have got AS08 in hand now, but it won’t talk to my Smartpilot S3, any idea?