U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9751467 PUBLICATION DATE: 11/08/2011 Name: LOVANGO CAY, ST JOHN VI NOAA Chart: 25647 Latitude: 18° 21.6' N ( 18.36067) USGS Quad: Eastern St. Thomas Longitude: 64° 48.2' W ( -64.80353) To reach the bench marks by boat from the Ferry Terminal in Redhook, St Thomas proceed 0.8km (0.5 mi) ENE from the harbor, then 3.2km (2 mi) NE to the north side of Two Brothers rocks, and continue 2.4km (1.5 mi) NE to the western most of two identical wooden docks on the south side of Lovango Cay. The Aquatrak well is midway along the dock and the benchmarks are along the shore. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1467 B 2011 DESIGNATION: 975 1467 B MONUMENTATION: Bench Mark disk VM#: 20003 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: In rock outcrop OPUS PID#: BBCM26 LATITUDE: 18° 21.7' N ( 18.36102) LONGITUDE: 64° 48.2' W ( -64.80387) The primary bench mark is a disk set at the base of a bedrock slope above a stone beach, 49.59 m (162.7 ft) west of bench mark 975 1467 A, 49.39m (162.0 ft) west of a 2 m (6 ft) tall yellow bollard at the west edge of a concrete ramp between a pair of wooden piers, 39.71 m (130.3 ft) east of bench mark 975 1467 C, 6.40 m (21.0 ft) north of the water's edge, and 0.25 m (0.8 ft) above the stone beach.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9751467 PUBLICATION DATE: 11/08/2011 Name: LOVANGO CAY, ST JOHN VI NOAA Chart: 25647 Latitude: 18° 21.6' N ( 18.36067) USGS Quad: Eastern St. Thomas Longitude: 64° 48.2' W ( -64.80353) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1467 A 2011 DESIGNATION: 975 1467 A MONUMENTATION: Bench Mark disk VM#: 20004 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete ramp OPUS PID: LATITUDE: 18° 21.7' N ( 18.36092) LONGITUDE: 64° 48.2' W ( -64.80342) The bench mark is a disk set near the west edge of a concrete ramp between a pair of wooden piers, 49.59 m (162.7 ft) east of bench mark 975 1467 B, 20.70 m (67.9 ft) west of a 2 m (6 ft) tall yellow bollard on the east side of the concrete ramp, 5.82 m (19.1 ft) north of the first cleat on the western most of the pair of wooden piers, 5.37 m (17.6 ft) south of a large tree which is just north of the concrete ramp, 2.12 m (7.0 ft) north of the seaward extent of the concrete ramp and the beginning of the western most of the two wooden piers, and 0.23 m (0.8 ft) east of the west edge of the concrete ramp. BENCH MARK STAMPING: 1467 C 2011 DESIGNATION: 975 1467 C MONUMENTATION: Bench Mark disk VM#: 20005 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: In rock outcrop OPUS PID: LATITUDE: 18° 21.7' N ( 18.36108) LONGITUDE: 64° 48.3' W ( -64.80425) The bench mark is a disk set in a low and flat section of bedrock outcrop at the top of a stone beach, 41.51 m (136.1 ft) east of bench mark 975 1467 D, 39.71 m (130.3 ft) west of bench mark 975 1467 B, 6.44 m (21.1 ft) north of the water's edge, 1.11 m (3.6 ft) east of a 0.15 m (0.5 ft) diameter tree that is 3 m (10 ft) tall, and 0.09 m (0.3 ft) above the stone beach.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9751467 PUBLICATION DATE: 11/08/2011 Name: LOVANGO CAY, ST JOHN VI NOAA Chart: 25647 Latitude: 18° 21.6' N ( 18.36067) USGS Quad: Eastern St. Thomas Longitude: 64° 48.2' W ( -64.80353) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1467 D 2011 DESIGNATION: 975 1467 D MONUMENTATION: Bench Mark disk VM#: 20006 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: In rock outcrop OPUS PID: LATITUDE: 18° 21.7' N ( 18.36108) LONGITUDE: 64° 48.3' W ( -64.80464) The bench mark is a disk set at the base of the last bedrock outcrop west of the twin wooden piers, 110.7 m (363 ft) east of the east edge of a sand driveway with posted no trespassing sign, 41.51m (136.2 ft) west of bench mark 975 1467 C, 12.18m (40.0 ft) west from the highest point of a 1.2 m (4 ft) square boulder, 5.20 m (17.1 ft) north from the water's edge, and level with the stone and gravel beach. BENCH MARK STAMPING: 1467 E 2011 DESIGNATION: 975 1467 E MONUMENTATION: Bench Mark disk VM#: 20007 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 18° 21.6' N ( 18.36083) LONGITUDE: 64° 48.2' W ( -64.80269) The bench mark is a disk set in the SW corner of 2.36 m (7.7 ft) by 1.15 m (3.8 ft) concrete slab, 20.85 m (68.4 ft) ENE from the top center of a 1.5 m (5 ft) tall elephant statue in a garden, 14.99 m (49.2 ft) NE from a large almacigo tree, 10.98 m (36.0 ft) north from the NW corner of a 0.85m (2.8 ft) high wood deck attached to a house, 7.70 m (25.3 ft) WSW from the SW corner of a utility shed, 3.22 m (10.6 ft) north of the centerline of a single lane gravel drive, and level with the surrounding lawn.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9751467 PUBLICATION DATE: 11/08/2011 Name: LOVANGO CAY, ST JOHN VI NOAA Chart: 25647 Latitude: 18° 21.6' N ( 18.36067) USGS Quad: Eastern St. Thomas Longitude: 64° 48.2' W ( -64.80353) T I D A L D A T U M S Tidal datums at LOVANGO CAY, ST JOHN based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: May 2011 - July 2011 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9751639 CHARLOTTE AMALIE, ST. THOMAS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.322 MEAN HIGH WATER MHW = 0.242 MEAN SEA LEVEL MSL = 0.151 MEAN TIDE LEVEL MTL = 0.150 MEAN LOW WATER MLW = 0.057 MEAN LOWER LOW WATER MLLW = 0.000 Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1467 B 2011 1.619 1.377 1467 A 2011 1.214 0.972 1467 C 2011 1.587 1.345 1467 D 2011 1.568 1.326 1467 E 2011 1.734 1.492
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9751467 PUBLICATION DATE: 11/08/2011 Name: LOVANGO CAY, ST JOHN VI NOAA Chart: 25647 Latitude: 18° 21.6' N ( 18.36067) USGS Quad: Eastern St. Thomas Longitude: 64° 48.2' W ( -64.80353) D E F I N I T I O N S Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal Datum Epoch. It pertains to local mean sea level and should not be confused with any other fixed island datum. This tide station location has a defined island datum (VIVD09). Island datums are specific fixed geodetic datums whose elevation relationship to local MSL and other tidal datums may not be consistent from one location to another. Virgin Islands Vertical Datum of 2009 (VIVD09) is a fixed datum derived from a simultaneous, least squares, minimum constraint adjustment of leveling observations. Local mean sea level relative to the 1983-2001 National Tidal Datum Epoch observed at tide stations 9751401 located at Lime Tree Bay, St. Croix, 9751381 located at Lameshur Bay, St. John, and 9751639 located at Charlotte Amalie, St Thomas was held fixed as the single initial constraint. VIVD09 replaces all previous height system as the national standard geodetic reference for heights in the Virgin Islands. Bench mark elevations relative to VIVD09 are available from NGS through the World Wide Web at National Geodetic Survey. The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique identifiers for bench marks in the tidal and geodetic databases, respectively. Each bench mark in either database has a single, unique VM# and/or PID# assigned. Where both VM# and PID# are indicated, both tidal and geodetic elevations are available for the bench mark listed. The NGS's Integrated Data Base (IDB PID) provides geodetic datum based on traditionally leveled and bluebooked ties to the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/. The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/. The VIVD09 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have VIVD09 elevations. The VIVD09 elevation relationship shown in the table is derived from an average of several bench mark elevations relative to tide station datum. As a result of this averaging, VIVD09 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from VIVD09 elevations listed for each bench mark in the NGS database.