New sonar /gps advice sought

I'm tired of buying a Garmin 441s every 2 years because they get wet inside on my AI.  I share the unit between my powerboat and another kayak so I have some investment in transducers.  Does the Lowrance units have the same problem with a few waves washing over them?  Not to mention whats a "Chirp"?  Does the Humimngbird units stay dry?  Thanks in advance. Dave

I have surf launch with my humminbird in my trident's sonar pod for years without any problem.

But I recently killed a humminbird surf launching my hobie when the sd card hatch popped open when it was hit by a crashing wave and water went inside. Even though the unit was rated for submergence, it could not stand up to the force of a crashing wave. Next time I will store it inside the hatch for surf launches.

As the owner of a Hummingbird unit with an SD slot who surf-launches, thank you for that information.

Lowrance can be killed by water as well most ff are rated for some water but not water with force like a wave or even a hard rain

someting that can help is to make a protecting cover you can even add a sun shade for easy reading
I suggest use it plastic sign board
The water. An hit the board but not penetrate the board and it takes little time to make one