RedactedNarrative: V1 was traveling south in willoughby creek at approximately 0230 hours. Willoughby creek is a designated slow speed zone. Operator stated he was trolling. Operator stated he failed to observe channel marker in the water way and struck the marker. Operator stated he was ejected from the vessel and the vessel continued moving and ran aground. The vessel was observed grounded upon my arrival on scene. Operator stated he was uninjured and swam to shore. Operator called sea tow for assistance at approximately 0900 regarding the vessel grounded on the property. Sea tow arrived on scene shortly before my arrival at approximately 0921 hours. Based on the damage to the channel marker and the vessel and distance on shore where the vessel was grounded, i estimated the vessel's speed to have been approximately 21-40 mph. The resident, stated he heard a vessel crash and heard someone calling for help at approximately 0230 hours. Resident stated he went out onto his dock to investigate but did not see the grounded vessel or the operator. Resident notified the martin county sheriff's office, however, responded units were unable to observe the grounded vessel from land. Nothing more to report at this time.