Hey everybody........newbie and 1st poster here.
Got a little problem maybe you guys can shed a little light on.
I have a Perception Caster 12.5 and a Humminbird Piranhamax 190c FF.
I mounted the transducer inside the hull laying flat on the bottom of the kayak....didn't glue it down yet as this was a test run......FF displayed 0 depth and no picture on the screen the entire time.....took the tranducer out and dangled over the side and it works perfectly.....

any ideas?
thanks in advance for the help