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Posts: 117
| You’ll find a ton of photos of various humminbird sonar installations here: http://www.bbcboards.net/showthread.php?t=172972
Most of the images at the link are on bassboats that normally have a jackplate—for these rigs the “normal” way to mount would be to put the SI transducer on the jackplate and use a y-cable so you can use a second 2D-only transducer epoxied in the bilge. This keeps the expensive SI transducer above the bottom of the boat where it’s protected from hitting rocks/stumps/bottom and avoids drilling holes in the boat, but the ducer epoxied in the bilge allows depth readings when on plane and at higher speeds, I think better than one that is transom-mounted. I’ve got this setup and get a good-enough sonar display and depth readout up over 55mph from the transducer in the bilge. If you don’t have a jackplate you can still put a SI ducer under the step, but unless the surface of the transducer is below the bottom of the hull so it’s wet when you are on plane you will lose your depth and sonar any time you are on plane, so you’d need to run a second transducer in the bilge. To do this you’d need a Y-cable and a XP-9-20 transducer in addition to whatever hardware you use to mount the SI ducer.
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