HISTORY
  CL858/90-- LETTER DATED 9/13/90 FROM RONALD A. KNAPP TO NOS.  REPORTS BOAT DRAWING 5 FEET 11 INCHES HIT UNCHARTED SUBMERGED ROCK AT APPROX. LOW TIDE.  VISUAL BEARINGS.  HE HAS NAMED THE FEATURE "MARGE'S ROCK". HE SENT COPY OF LETTER TO "NOTICE