RedactedNarrative: A yacht hit the walkway of the dock and another vessel due to shift failure.  The operator said he was forced to go towards the marina in order to avoid a smaller boat in the vicinity (v2). According to the operator, v2’s operator was distracted on the phone.  Operator1 attempted to sound his horn and tried to maneuver to avoid collision.  He found that his transmission cable on the starboard engine had come loose so he couldn’t go into reverse.  He ended up hitting the metal walkway from the land to the dock and scratched the port side near of the bow of v3.  Operator1 indicated he had over 10 years experience.