High speed puck... snapping noise

I just noticed this yesterday while my boat was inside my garage and drying out from a rainy trip. I was running my hummingbird locator and trying some different settings when I heard a snapping noise near the back. I have a side image transducer mounted on the back and also a puck epoxied to the floor of the boat under the gas tank for reading high speed depth. I had never really heard this before...but the high speed puck was making a snapping noise...and it wasn't a constant cadence but sometimes slowed down and speeded up.

I am wondering if my high speed puck has come loose ? Unfortunately I won't be able to determine that until I remove gas tank. I already was planning on removing my gas tank sometime soon to check out my livewell fittings ( I have a leak ) ...but have been trying to get the gas used up so as to minimize the amount I would have to siphon out.

I have run my locators plenty of times while the boat is out of the water, and I am pretty sure this is the first time I've ever heard the snapping noise. What do you think guys?


HHD

Sounds like it is looking for water.

If it stops making the noise THEN you have a problem. Its working as it should.

that "snapping noise" is the the pings send out from the transducer, it has always made them, but it is not good to run them out of the water, eventually it will harm them.

Nothing to worry about HHD. That snapping noise is the transmit pulse from the transducer and it will change as the unit is searching for the lake bottom. Some people can hear it and some cannot. What the transducer is parked over can change this so don’t worry. Running the transducer/unit out of the water will not harm it.