I just went through an upgrade for my Moorings 322 (aka Beneteau 323). The original electronics was all Raymarine, and I mostly stayed there.
NMEA to SeaTalk NG adapters as needed
goof plate from Front Panel Express
When I bought the boat 3 years ago it had an ST60+ Tridata, an ST40 Bidata, and an ST6002 autopilot control head, driving the Raymarine analog autopilot and drive unit. All was connected by SeaTalk (version 1). ST40 was connected to an Airmar 800 analog depth-only sounder. Plotter was a Raymarine RC 435i, so old that it took CF cards. I added a Vesper XB-8000 AIS, used iNavX for electronic charts, and just lived with the setup the first year.

When the autopilot failed, I started the upgrade. I replaced the autopilot control head, control unit, and compass with the Raymarine EV-100 package, and ran SeaTalk NG from the helm, down to the autopilot computer port side in the stateroom, and then back forward through the lazarette to the navigation station, where I connect the AIS. I also replaced the plotter with an Axiom 9 MFD. Because the depth sounder was still on SeaTalk V1, I added a SeaTalk to SeaTalk NG converter. ST6002 control head was replaced by the p70s that was included in the EV-100 bundle.
This past winter, I replaced the analog Airmar 800 depth sounder with a Raymarine digital Airmar 800 depth/speed/temperature transducer. I hadn’t realize the previous year that Raymarine’s digital version of the Airmar 800 DST was through-hull compatible with the analog. I extended the SeaTalk NG cable to the bow and put the DST sensor on the network.
However, that left me with no use for the ST40 Bidata. It had been needed earlier, to drive the analog depth sensor, but the digital readings from the new DST weren’t visible on it. I wanted to be able to see depth information on something other than my chart plotter, so I replaced the ST60+ with an i70s. The ST40 came out too. Since there were no more SeaTalk V1 instruments on the boat, the V1/NG converter came out too.
The hole was too big for what I had in mind, so I had a goof plug made, by Front Panel Express. I used 3 mm aluminum for the goof plate (I actually ordered a pair, outside and inside). I’m happy to share or post the design file for this, if anyone cares. Then I added the remote SD card reader to my Axiom 9 plotter. This means I don’t have to remove my helm station to get at the Axiom’s card reader.
The i70s and p70s used the same size cutout as the ST 60/ST6002. But the holes for the mounting screws are in slightly different locations. The cutout for the Axiom was considerably larger, so that was just a matter of buying a beer for my woodworking neighbor with the band saw.
It would have been simpler to have done all of the work at once, but I was just getting to know the boat and wasn’t comfortable pulling everything out. In particular, the depth sensor swap would have been cheaper if I had skipped the stage of using the Seatalk V1 to NG bridge.
Hal
s/v Yard Work