If Trolling motor is in the stowed position and you were trying to navigate to a waypoint slowly you will not have a heading line only course over ground. The Heading sensor for the trolling motor would only work if it is in the water. Also, if you have a external heading sensor GPS antenna you will have to turn off the terrova in order to have heading and course over ground from your external GPS. I have dealt with the same issue since purchasing mine. The heading sensor on the trolling motor works great if you are trying to cast to a waypoint

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