I actually have experience with STRAY currents in the water near a dock. A few years ago we went to the Thousand Islands with our little Donzi. We stayed at a motel on the "Other" side of the river just southwest of the International Bridge. I think the name of the motel was
The Torchlight. There was enough space at their dock for two boats. We were one of them.
In one week..maybe a little more..the weather was so freakin HOT, we never went out in the boat. We left it at the dock and went to the Clayton Museum by truck and spent the day there sitting under a tree. During that time at the dock..The outdrive SHED it's paint. The paint was mine...with propper prep. over factory paint. There was a little "Pump House" on the dock. Just sayin'.
NB