Can I add Sideimage to a down image unit by adding an SI transducer and upgrading the firmware in the head unit?
I can't find my head unit (either *I* put it away for the winter, and now I can't find it, or it grew legs and walked off)....
So I'm wondering, can I buy a new unit with fewer features, and upgrade the firmware to get side image using my already installed SI transducer?
-Philip