So here's a link I found form a post that Andy did about Down imaging and Structure scanning.
http://www.stripersonline.com/t/7961...aging-in-a-yak
You can do Down Imagine through the hull but side scanning has to be in the water. Paddling at 2 to 3 knots is not difficult, trust me I have done it. Paddle kayaks are only as slow as the paddler wants them to be. I think I know what system I'm going to pick up now, just need to save up a little more.