Freshwater is MUCH WORSE for electric
shock drowning that salt water
Your body will conduct the current BETTER that the surrounding fresh water, so currents will preferentially want to flow through you in fresh water. Current leaking into salt water
is not as dangerous since it has an easier time to flow back to source through the salt
water. All those fresh water marinas should have GFCI on the shore power
lines or ELCI breakers at minimum on the dock! IMO. Having it on the DOCK
protects people from leaky shore power
cords. If you just have ELCI or GFCI on the boat, the shore power cords not protected. I have seen shore power cords in the water and leaking current cause they are damaged gotten pinched when boat hits dock and cord in the way, etc...
A damaged cord happened on my boat and the shore power copper wire was eaten up about 2 feet. Insulation
looked reasonably ok. This happened in salt
water. If there had been an ELCI breaker on the shore power source, then my wire would not have been a hazard. Nobody got hurt, I just happened to notice one day when the boat had lost
All your wiring can be in great shape, then an accident
happens and the wire is damaged and now suddenly you got an issue.