re: rigging a fishfinder on a kayak

You need to buy a 12 v gel cell battery. They have them on amazon. Get a one amp inline fuse holder and fuse or as specified in your owners manual. You should have plenty of power and transducer cable. If I were you, I would just shoot through the hull and then you can have all of your hatches sealed. I use a tupperware container instead of a battery box because the inside of my kayak stays relatively dry. Look online for ways to mount your transducer.