RedactedNarrative: V1 was westbound, at approximately 25 MPH, in the St. Augustine Inlet, and was trying to get to Vilano Boat Ramp when the operator ran aground on the south tip of Porpoise Point in the dark. Due to the sea state the operator was unable to get V1 off the beach before V1 took on water grounded on the beach. The operator/owner of V1 declined commercial assistance, and said he would get V1 off the beach in the morning. I also advised owner  that whatever he did he could not just leave V1 on the beach if removal became too expensive/time consuming.