Hi Rich,
Sounds like you're having a smooth trip.
Weather has slowed down progress on my boat. Either too cold or wet (bottom job took a month), now this virus thing has everyone treading water to see where it's going.
Been working thru issues as I uncover them. Got into the helm panel last trip - replaced the Cobra VHF with a Standard Horizon with AIS receiver as you suggested - of course nothing is easy - mounting hole had to be whittled out for things to fit. PO wiring typical. Not a lot of clean up behind the helm panel necessary but the few changes/additions were not up basic marine standards - automotive butt splices, no water proofing - lot of 3M tape - doing nothing. etc etc.
There is a fire suppression system of some kind in the ER - bottle and some plumbing. Looks OEM. If there is any documentation - I haven't found it -yet! My Sea Ray had a similar set up - no docs, no info - makes one appreciate FAA requirements to document everything on A/C. Bonanza docs fill a 4 drawer (but it's a little older - 1949)
If it's a SeaFire System - their web site is worthless - no data there at all. Install manual is a joke.
Once behind the helm panel "alone" with time to think, (some times I have more "HELP' than I can live with - kids) I realized what ever the device was had been removed to make room for the depth finder. When the engine would not start after they cut it out - they spliced it back in and tie wrapped it to a wire bundle and closed the lid!! (Red Neck engineering at it's best)
Really didn't want to screw with it at the time - boat runs fine as is - but longer term I will put it back to OEM if possible - compliant with good practices and codes.
I suspect you are correct - probably a few hidden zingers - buried somewhere. Been very suspect of anything that looks like it's been changed and closely watching operationally critical parameters - temps/pressures/amps etc. when away from dock.
Have a fun trip around the lower end .... thanks for the comments!
Smooth seas and fair winds!
Larry