Total cost was a little under $200 I think. PiranhaMAX from Walmart, about $150. 12V alarm system battery from Home Depot, about $20 and watertight box for battery about $10.
Used marine goop to secure the battery box and transponder to the inside of the hull. Slice a pool noodle about 2" thick and trace the transponder outline on it. Use razor knife to cut out the middle of the noodle and goop the noodle to the inside of the hull. After it dries and is secure, fill transponder cutout with about an inch of goop and then gently push transponder down into goop filled noodle mount. Make sure there are NO air bubbles in the goop, or the transponder may not function properly. It's hard to see it in the picture because I used a pink noodle, but the transponder is mounted about a foot aft of the battery enclosure inside the hull.
This setup does the trick for me, water depth is accurate and bottom formation and structures are pretty easy to read. Much better than nothing at all!
Have a good one!
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