I recently installed a 365i with the transducer at the rear of the boat. Is it normal when the boat is out of the water, say in the garage, for the transducer to make a ticking sound when the unit is powered ON? I assume it is the sonar pulse, but just wanted to make sure because I have a Matrix 17 on the front and it does not make this sound.

I have the matrix 17, which I know has been discontinued. Are there any software updates for this unit? I have never upgraded the software on this unit and it is approx. 5 years old.