RedactedNarrative: Unit 1 & Unit 2 were tied up to the courtesy dock at W.O. Thomas Jr. Landing on the landing on the Ashley River. Unit 1 untied lines from the dock and the throttle on the boat became jammed. Unit 1 collided with Unit 2. The starboard side of Unit 1's hull impacted he bow railing of Unit 2. Operator of the Unit 1 stated that the throttle ad been sticking throughout the day and they were attempting to take the boat off the water.