What transducer are you using for on-plane depth readings and where is it installed?
Contact Humminbird Customer Service is assistance with trolling motor RFI.
You "think" what the unit models are?????
Edited by Wayne P. (07/10/15 03:15 PM)
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1