AA0268 ***********************************************************************
AA0268  TIDAL BM    -  This is a Tidal Bench Mark.
AA0268  DESIGNATION -  872 4138 TIDAL 4
AA0268  PID         -  AA0268
AA0268  STATE/COUNTY-  FL/MONROE
AA0268  USGS QUAD   -  BIG PINE KEY (1972)
AA0268
AA0268                         *CURRENT SURVEY CONTROL
AA0268  ___________________________________________________________________
AA0268* NAD 83(1986)-  24 39 16.     (N)    081 16 54.     (W)     SCALED
AA0268* NAVD 88     -         7.350  (meters)      24.11   (feet)  ADJUSTED
AA0268  ___________________________________________________________________
AA0268  GEOID HEIGHT-         -21.91  (meters)                     GEOID99
AA0268  DYNAMIC HT  -           7.337 (meters)      24.07  (feet)  COMP
AA0268  MODELED GRAV-     978,965.0   (mgal)                       NAVD 88
AA0268
AA0268  VERT ORDER  -  FIRST     CLASS II
AA0268
AA0268.The horizontal coordinates were scaled from a topographic map and have
AA0268.an estimated accuracy of +/- 6 seconds.
AA0268
AA0268.The orthometric height was determined by differential leveling
AA0268.and adjusted by the National Geodetic Survey in June 1991.
AA0268
AA0268.This Tidal Bench Mark is designated as VM 6368
AA0268.by the Center for Operational Oceanographic Products and Services.
AA0268
AA0268.The geoid height was determined by GEOID99.
AA0268
AA0268.The dynamic height is computed by dividing the NAVD 88
AA0268.geopotential number by the normal gravity value computed on the
AA0268.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
AA0268.degrees latitude (g = 980.6199 gals.).
AA0268
AA0268.The modeled gravity was interpolated from observed gravity values.
AA0268
AA0268;                    North         East    Units  Estimated Accuracy
AA0268;SPC FL E     -    35,600.      171,490.      MT  (+/- 180 meters Scaled)
AA0268
AA0268                          SUPERSEDED SURVEY CONTROL
AA0268
AA0268  NGVD 29     -         7.774  (m)           25.51   (f) ADJUSTED    1 2
AA0268
AA0268.Superseded values are not recommended for survey control.
AA0268.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
AA0268.See file dsdata.txt to determine how the superseded data were derived.
AA0268
AA0268_MARKER: DJ = TIDAL STATION DISK
AA0268_SETTING: 36 = BRIDGE
AA0268_STAMPING: NO 4 1936
AA0268_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
AA0268
AA0268  HISTORY     - Date     Condition        Recov. By
AA0268  HISTORY     - 1936     MONUMENTED       CGS
AA0268  HISTORY     - 1966     GOOD             NGS
AA0268  HISTORY     - 1970     GOOD             NGS
AA0268  HISTORY     - 1978     GOOD             NGS
AA0268  HISTORY     - 1982     GOOD             FLDNR
AA0268
AA0268                          STATION DESCRIPTION
AA0268
AA0268''DESCRIBED BY NATIONAL GEODETIC SURVEY 1966
AA0268''13.4 MI SW FROM MARATHON.
AA0268''ABOUT 13.4 MILES SOUTHWEST ALONG U.S. HIGHWAY 1 FROM THE POST
AA0268''OFFICE AT MARATHON, ON BAHIA HONDA KEY, NEAR THE EAST BANK OF
AA0268''BIG SPANISH CHANNEL, AT THE EAST END OF THE BRIDGE OVER CHANNEL,
AA0268''SET ON THE TOP OF THE SOUTH CONCRETE WING WALL, 105 YARDS WEST
AA0268''OF THE EAST END OF THE BRIDGE, 16 FEET SOUTH OF THE CENTER LINE
AA0268''OF THE HIGHWAY (MEASURED UNDER THE BRIDGE), 17.2 FEET NORTHWEST
AA0268''OF W BAHIA RM 2 AND ABOUT 30 FEET BELOW THE LEVEL OF THE HIGHWAY.
AA0268
AA0268                          STATION RECOVERY (1970)
AA0268
AA0268''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1970
AA0268''RECOVERED IN GOOD CONDITION.
AA0268
AA0268                          STATION RECOVERY (1978)
AA0268
AA0268''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
AA0268''RECOVERED IN GOOD CONDITION.
AA0268
AA0268                          STATION RECOVERY (1982)
AA0268
AA0268''RECOVERY NOTE BY FL DEPT OF NAT RES 1982
AA0268''RECOVERED IN GOOD CONDITION.  THE DESCRIPTION IS ADEQUATE EXCEPT NOTE
AA0268''THAT THE MARK IS IN THE OLD HIGHWAY BRIDGE, NOW A HISTORIC MONUMENT
AA0268''AT BAHIA HONDA STATE RECREATION AREA.