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The 12vdc equipment will work fine as is.
You have three options on the 230VAC side:
1- Install a 120VDC:230VDC transformer, so you can take US dockside power and feed it to the boat and any 230VAC equipment on the boat. That's cheap--but ou won't be able to sue US AC devices without further adapters.
2- See if the charger/inverter can be switched to 120VAC. If it can, keep it, rewire the rest of your sockets direct for 120VAC.
3- Scrap the AC stuff, get a 120VDC charger/inverter, and live off DC.
The best solution will really depend on what you can junk/convert/save and you are probably best off waiting till you get hands on eyes on all of it to find out just what's on the boat. Not what the boat was supposedly built with, but what's really on it now, and how well that suits your needs.