would like to put a graph on my yak any suggestions? i have heard they dont work in shallow water. mainly just wanting to see bottom contour and deep. THANKS
For your purpose, you might consider what I use. I picked up one of the old Eagle Portable Fish Finder with Battery Power Pack units from a fellow TFF member on the trading post forum for $20, but you can always find them on ebay for $50 to $75. An example of one:
http://cgi.ebay.com/Eagle-Fish-ID-128-Portable-Fish-Finder_W0QQitemZ300238664936For mine I permanently mounted the transducer behind my seat and spliced in a connector. Though my kayak is of a three layer type, my transducer still shoots through the hull just fine. You could also probably get by with the suction cup transducer mount that most of those type depth finders came with.
The fish finder unit and battery pack is set on my front deck with the deck straps crossed over the battery pack to hold the whole thing in place. The transducer cable is just run along the floor of my kayak and plugged into the connector on my transducer. I then turn the unit on and off and operate the controls with the edge of my paddle.