Re: electrical hazared
My take, the marina is supposed to have GFI on every circuit. If there was stray current in the water the GFI wasn't installed or it wasn't working properly.
gfci doesn't protect against stray current it protects against current imbalance so up to 4ma can be lost before a gfci reacts. swimming in 3ma is enough to cause a problem that can stop you swimming. The whole case will be based on not how it happened as that would involve one person but it will be based on the fact that neither the boat or the dock had a indicator that shows voltage detected in the water. This is because any of the boats in the marina could have been the problem so you would have to prove which one was the one leaking voltage to the water.
There is no required code that says you have to have a detector in the water but if you knew the risk you should not have allowed a person to enter the water via your boat or the marina should not have allowed swimming with out the detector. Spin doctoring will be added like did you test the gfci before use, is there a record for the gfci test, is the test certified by a marine electrician, etc etc
The part that people should learn about this case is not what someone else done wrong but the fact that in this day and age if someone has a problem on your boat even if it the fault is not yours you will be dragged to court.