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Im considering adding a chart plotter/fish finder to my 2015 R5. I really don't want to drill a hole thru the hull for a new transducer, nor do i want to use a transom mount transducer. Where is the Cobalt factory installed transducer which provides the standard/default depth finder and water temp gauges with their readings? Or is a transducer not being used for these gauges? I'd like to know what options exists for using the factory installed transducer with a new chart plotter, or if a thru hull hole already exists and perhaps this can accept a second cable for a new, second transducer? Or maybe I've had one to many cocktails this evening and this questions just doesn't make any sense

The transducer for my 2017 is drilled through the hull. Personally, it wouldn't be a concern to me adding this type of transducer(Garmin with NEMA interface). The portion outside the boat sits flat with the hull.

In a previous boat we added a transducer as a "shoot thru hull" as opposed to "thru hull". When done properly, (either with a oil base or even dunked in resin, gotta be careful to remove ALL bubbles with resin) there is minimal loss of sensitivity. (depending on hull, cored or not, ) Just another option.
I'm going to add some sonar but we will probably just hang them off the transom.

CaptBob wrote: Sat Feb 20, 2021 10:57 am In a previous boat we added a transducer as a "shoot thru hull" as opposed to "thru hull". When done properly, (either with a oil base or even dunked in resin, gotta be careful to remove ALL bubbles with resin) there is minimal loss of sensitivity. (depending on hull, cored or not, )
shoot tru hull.jpg

Just another option.
I'm going to add some sonar but we will probably just hang them off the transom.

I have done the exact same thing before. It worked pretty well. Made a fiberglass box that was open on the bottom with a lid. Epoxied it in and then had the transducer mounted to the lid. We floated some mineral oil on top of the water so it didn't evaporate.

thank you all for the info.