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I have a similar issue due to lack of experience. This is my first boat and I am looking for assistance in determining the best mounting location for the transducer. The boat is a 2012 Montauk 150 and I bought a Raymarine Dragonfly fishfinder. The manual advises to mount it on the starboard side of the boat at least 12" away from the propeller. I tooks some photos to show some potential locations, they are on my personal page.

On the starboard side of the keel there are several protrusions in the hole for the live well which will likely affect performance. So I can mount it a few inches further out on the first chine. These protrusions don't exist on the port side so that would be another option but not directed by the manufacturer. I could also put this further out starboard but I don't know how it will perform there and isn't advised based on the previous posts.

Any help would be much appreciated
Thanks,
Ian