Just an observation...I purchased a Humminbird Piranha Max fish finder a few years back that had a castable RSS
module that I only used a few times before the unit was put in “dry dock” in my office.
Fast forward to today...when I took the unit out to replace the batteries, I found out the RSS module had an internal, non-replaceable lithium battery. With no way to check if the battery was still good, I decided to contact Humminbird to order a replacement. After waiting on hold for several minutes, I decided to leave a call back number. This was at 12:00P.M., and I still haven’t got a call. In the meantime, I did an online chat requesting a part number for the module, and was told they were no longer available. I could either order a transducer with a 15’ cable, but there was no ice transducer got this unit. So here I sit with a fish finder with no options for use. I would think if Humminbird sold a product, they should have replacement parts. Their attitude was ambivalent in my opinion, and certainly not the kind of customer service one would expect from this company. I don’t think I will buy another Humminbird product. Rant over!