Monkey SEA Monkey DOO

I am a proud owner of 2010 Sea Doo Challenger and recently relocated from Chicago to Sunny Miami.
I am planning on installing a chartploter with a sounder so I could use as a fish finder as well as being able to the see the contour of the bottom.
I was wondering if I could use the existing In-Hull transducer or if I need to install another transducer, and if so what type would be best (In-hull vs. Transon mounted).