So OK ... if you are wondering if there is a problem in your electric system, something to look for is a lower voltage reading on the GPS voltage window ... than at the panel or at the battery direct.
And also if your new radio is dropping from 25W transmit to 1W and calling out low voltage, when you have reasonably new batteries.
I'm thinking there may have been at least three different panels installed.
This one is from #526 and is different from the one installed in #505.
It is ~6-3/8 in. by 10 in.
The other stuff is related to the AC and Stove/Oven control ...
note although there is a anchor light noted ... don't think any were ever factory installed. Note dozen fuses and generic J Boat logo.
The right column fuses were Radio, GPS, something I forget and Aux 1,2 and 3.
The Vee Jays have "Night" which turns on 5w red night lights at the top of the stairs and under the head sink ... Always good to have some red stuff going at night.
Also boat came equipped with 2 water tanks, water heater, water pressure pump etc. was basically cruising version.