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Posts: 546
Location: MN | The Side imaging transducer that comes with a MEGA SI unit will read 2D/DI/SI. However, all large SI transducers will loose contact with the bottom at high speed, while on plane due to an air pocket developing under the transducer. Some people will try to tilt the back of transducer down one or two notches to eliminate this air pocket, but will sacrifice the image quality and depth accuracy of the unit in doing so. The correct solution is to mount your MEGA transducer level so that it is below the water while at off-plane speeds and utilize a two-transducer system, joined together with a Y-cable. It is okay if this location of the SI transducer is out of the water while on plane- see below.
DI and SI still come from the large standard transducer that come with the unit.
2D sonar comes from either a transom-mounted high-speed skimmer transducer (aluminum or fiberglass boats) OR a shoot-thru-the-hull high-speed transducer (fiberglass only). The Y cable will have both transducers plug into a specific side of the cable and join the signals into a single plug that goes into the back of the unit. Even if the large SI/DI transducer is out of the water while on plane, your high-speed 2D transducer will still yield your depth, as it is suited and positioned to hold bottom at these speeds.
Edited by mtcook16 6/6/2017 4:40 PM
(MSI DB Y configuration.png)
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 MSI DB Y configuration.png (112KB - 686 downloads)
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