I have a 2022 model C30 Sedan. The boat came with an AIS receiver built into the Garmin VHF radio. So no separate receiver box. I bought an em-trak B953 AIS transceiver, which is smaller in size than the Garmin 800 and Cortex. I also mounted mine inside the cabinet behind the helm, but I utilized a different location. With the smaller size I was able to mount it to the side of the cabinet opening. Specifically, I open the mirror in the head and immediately to the right of the opening the fiberglass wall begins to bend into the shower mold. The wall has a large straight section just before the bend and the small em-trak units fit on this section just perfectly. It’s very secure and I can also easily see the operational lights on the top of the box. Mounting in this general location allows easy routing of the wires and necessary cable connections. I also changed out several of the individual NEMA “T” connections and instead put in a single 4-port connection that saved a significant amount of space and easily allowed me to install the new port for the AIS. To do this I just used one of the individual T ports I had replaced with the multiport piece. The em-trak is pre-wired to accept a “silence” switch, if doing so is desired. Since I don’t want to transmit while in the marina I did this. I put the switch thru the bottom of the same cabinet. It’s a simple toggle that is not noticeable but is reachable just below the cabinet, so I don’t have to open the mirror. The AIS unit works great. Once I was done with the installation I simply turned off the receiver unit inside the Garmin VHF since I didn’t need 2 receivers.