PW,
I have the Humminbird 997 and love it. I'm fishing out of a 2005 Tracker Nitro. The trolling motor that came on the boat is weak to say the least. (12volt 46lb motor guide.) On the way is a 80lb 24 volt Minn Kota. I think the trolling motor you are talking about is one of the Terrova's with autopilot.
Try this: http://www.minnkotamotors.com/produc...pg=fbm_terrova
Later and good luck,
Buzz