I remember reading a few years ago about a couple doing the great loop. in a 36' boat. They said they had been told they could dock at city docks in Chicago, and go to hotel
for night. They were told it was safe because the police patrolled it regularly . They docked with a few other boats at that city dock downtown. Then just decided to spend night on board so could leave early in morning. About 2 A M husband awakes to sounds on board, came out of cabin
with a flare gun and chased 3 young men
off his boat. They were not going to set boat adrift. Just steal what they could.
So a boat in city with police patrols early morning Chicago. Or a public dock in day light, with possible no security
? Locks keep out honest people.