They work with small bodie cannons. Electric mini mags, easy troll, and sport trolls. Like stated they need the square catch and thumb screw as seen in the picture. This one just happens to be mounted to clamp on mount.
I found 2 base plates with hardware that I will include for $25 for both with the holders . So that would be $275 plus shipping for holders and base plates.
Comes with mounting bracket. It is DI and SI compatible. Has Lake insight. Was used to interface to my Yamaha motor as the tach, speed, water temp, trim indicator , and hour meter. Also I used it for mapping. Would make a great finder to put on the transom or helm. Lost one mounting knob and replaced with a bolt.
I have a real nice set of lowrances for sale HDS 7 gen 2 and HDS 5 gen 2. They both have gimbal mount and power cords. One transducer. Insight mapping Can be etherneted together. Ideal for one at the helm and one at the stern. Looking to get $550 TYD.