RedactedNarrative: LARGE BOAT RAN AGROUND JUST OFF HARVARD ISLAND AT ENTRANCE TO BLACKEY COVE.  OPERATOR SAID HE WAS RETURNING TO HIS HOME AND OPERATING WITHOUT HIS RADAR ONLY RELYING ON GPS. THE GPS HAD NOT BEEN REPORTING ACCURATE LOCATIONS DURING HIS TRIP HOME.  HE WAS THE ONLY ONE ON THE BOAT.