I started out with mine on the trolling motor and have moved it to a pole mount now. It works a lot better for me I have spot lock and it drove me crazy trying to fish brush piles. Here is the mount I used.
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Fishing Specilities Poleducer... Fishfinder Depthfinder Mounting Accessories - Fishing Specialties Inc
bflowers LIKED above post
All Aboard Transducer Mounts, best out there for the money and super nice guy. Tell him Bret sent ya.