We were in that line! That was a maddening exit from SF canyon last year.
Wake less is typically 5mph or less and so posted. With the prop on my boat that's 900 rpms. At that speed my boat leaves a visible wake, but certainly nothing that would rock another boat. My last boat without a GPS fish finder didn't move the speedometer at that speed with the water pickup off the motor.thing is what defines wakeless in the zones??IMO water cops can take any thing they see as a wake yes i have been at slowest idle and stopped to be checked out let go with warning as if they have done me a favor.Other times i have set engine to 900 rpm and not even looked at just a small ripple off the boat
Been at wakeless but have had the ferry boat almost run me over in a narrow part too had i gone faster i would have made a small wake.