Can I plug my Earthing® products into the outlet on a houseboat?
As long as the boat is connected to a shore power, an electrical outlet ground will ground you.
When a boat is not connected to shore power and is running on a generator, the outlets may not be ground. You will need to check with the manufacturer.
If your boat is in salt water, you can connect your Earthing® product to an Earthing® Ground Rod and dangle it over the side of the boat and into the water to ground you.