U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9751768 PUBLICATION DATE: 11/18/2011 Name: RUY POINT, ST THOMAS VI NOAA Chart: 25641 Latitude: 18° 22.3' N ( 18.37125) USGS Quad: CENTRAL ST THOMAS Longitude: 64° 57.8' W ( -64.96347) To reach the tidal bench marks from the Cyril E. King Airport on St. Thomas, exit the airport and turn right onto the Moravian Highway Route 30 and travel east for 0.6 km (0.4 mi), then turn left on Crown Mountain Road Route 33 and travel 1.1 km (0.7 mi) north, then turn right on Scott Free Road winding northward for 1.9 km (1.2 mi) to Route 40, turn left onto Theodore Boschulte Drive Route 40 traveling NW for 0.1km (0.06 mi) to a large intersection, take a slight left onto the western most road Route 33 Lionel Pierre Berry Scenic Drive, continue generally NW for 2.0 km (1.25 mi), then turn right onto Route 333 a poorly marked road heading north and downhill for 0.9 km (0.5 mi) to a three way fork in the road, continue downhill 1.0 km (0.6 mi) on the center unmarked unnamed road that is slightly to the left to a turn around and un-gated private driveway to a condo complex, continue on the driveway that circles the complex to the west for 0.13 km (0.1 mi) to the end of the road, then travel by foot on a horse trail that starts just west of the last parking area and winds up the hill to the west 0.5 km (0.3 mi) north to the end of Ruy Point and the bench marks are in the bedrock surrounding the end of the point. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1768 A 2010 DESIGNATION: 975 1768 A MONUMENTATION: Tidal Station disk VM#: 19767 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 18° 22.3' N ( 18.37136) LONGITUDE: 64° 57.8' W ( -64.96367) The primary bench mark is set flush in bedrock on the eastern side of the end of Ruy Point just north of a large diagonal sheet of volcanic bedrock that runs from the tree line down to the water, 21.72 m (71.2 ft) SE of bench mark 975 1768 B, 14.85 m (48.7 ft) slope distance east of the center of the footpath where it emerges from the tree line, 12.59 m (41.3 ft) west of a blunt pinnacle rock surrounded by red bedrock at the water line, 12.10 m (39.7 ft) slope distance east from the grass line, and 0.55 m (1.8 ft) above the surrounding bedrock that flattens out as it approaches the water.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9751768 PUBLICATION DATE: 11/18/2011 Name: RUY POINT, ST THOMAS VI NOAA Chart: 25641 Latitude: 18° 22.3' N ( 18.37125) USGS Quad: CENTRAL ST THOMAS Longitude: 64° 57.8' W ( -64.96347) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1768 B 2010 DESIGNATION: 975 1768 B MONUMENTATION: Tidal Station disk VM#: 19768 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 18° 22.3' N ( 18.37144) LONGITUDE: 64° 57.8' W ( -64.96333) The bench mark is set flush in bedrock on the eastern side of the largest and most eastern of three bedrock points that extend north into the water from the end of Ruy Point, 21.72 m (71.2 ft) NW of bench mark 975 1768 A, 15.31 m (50.2 ft) SE of bench mark 975 1768 C, 9.37 m (30.7 ft) west of the southern of two jointed bedrock pinnacle points at the water line, 8.16 m (26.8 ft) slope distance NE down from the grass line at the beginning of this bedrock point, 5.96 m (19.6 ft) slope distance east of the ridge of this bedrock point. BENCH MARK STAMPING: 1768 C 2010 DESIGNATION: 975 1768 C MONUMENTATION: Tidal Station disk VM#: 19769 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID#: BBCJ02 LATITUDE: 18° 22.3' N ( 18.37153) LONGITUDE: 64° 57.8' W ( -64.96342) The bench mark is set flush in bedrock on the largest and most eastern of three bedrock points extending north into the water from the end of Ruy Point, 41.65 m (136.6 ft) sloped north of the center of the footpath at the tree line, 30.17 m (99.0 ft) NE of bench mark 975 1768 D, 19.25 m (63.15 ft) slope distance north of the grass line at the top of the bluff, 15.77 m (51.7 ft) NW of the southern of two jointed bedrock pinnacle points at the water line on the east side of Ruy Point, 15.31 m (50.2 ft) NW of bench mark 975 1768 C, 2.77 m (9.08 ft) north of the end of the primary ridge of the bedrock point.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9751768 PUBLICATION DATE: 11/18/2011 Name: RUY POINT, ST THOMAS VI NOAA Chart: 25641 Latitude: 18° 22.3' N ( 18.37125) USGS Quad: CENTRAL ST THOMAS Longitude: 64° 57.8' W ( -64.96347) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1768 D 2010 DESIGNATION: 975 1768 D MONUMENTATION: Tidal Station disk VM#: 19770 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 18° 22.3' N ( 18.37136) LONGITUDE: 64° 57.8' W ( -64.96367) The bench mark is set flush in bedrock on the western side of the base of the center of three bedrock points extending north into the water from the end of Ruy Point, 30.17 m (99.0 ft) SW of bench mark 975 1768 C, 14.56 m (47.8 ft) south of the northern end of the center bedrock point, 5.14 m (16.9 ft) slope distance north of the grass line at the top of this bedrock point, 2.83 m (9.3 ft) slope distance west of the ridgeline of the center bedrock point, 0.86 m (2.8 ft) east of the eastern edge of a small, coral and stone beach in between the western and center bedrock points, and 1.14 m (3.7 ft) above the level of the beach.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9751768 PUBLICATION DATE: 11/18/2011 Name: RUY POINT, ST THOMAS VI NOAA Chart: 25641 Latitude: 18° 22.3' N ( 18.37125) USGS Quad: CENTRAL ST THOMAS Longitude: 64° 57.8' W ( -64.96347) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1768 E 2010 DESIGNATION: 975 1768 E MONUMENTATION: Tidal Station disk VM#: 19771 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock Outcrop OPUS PID: LATITUDE: 18° 22.3' N ( 18.37125) LONGITUDE: 64° 57.8' W ( -64.96378) The bench mark is set flush in bedrock in the middle of the western most of three bedrock points that extend north into the water from Ruy Point, 19.25 m (63.2 ft) NE of the northern edge of a large stone beach that is oriented north-south turning to the west and to sand on the southern end, 18.02 m (64.4 ft) SW of bench mark 975 1768 D, 10.45 m (34.28 ft) slope distance north of the tree line, 3.31 m (10.8 ft) west of the small coral and stone beach separating the western and center bedrock points, 1.61 m (5.3 ft) above the level of the small coral and stone beach.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9751768 PUBLICATION DATE: 11/18/2011 Name: RUY POINT, ST THOMAS VI NOAA Chart: 25641 Latitude: 18° 22.3' N ( 18.37125) USGS Quad: CENTRAL ST THOMAS Longitude: 64° 57.8' W ( -64.96347) T I D A L D A T U M S Tidal datums at RUY POINT, ST THOMAS based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: December 2010 - March 2011 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9755371 SAN JUAN, LA PUNTILLA, SAN JUAN BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.393 MEAN HIGH WATER MHW = 0.318 MEAN SEA LEVEL MSL = 0.177 MEAN TIDE LEVEL MTL = 0.176 MEAN LOW WATER MLW = 0.034 MEAN LOWER LOW WATER MLLW = 0.000 Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1768 A 2010 4.804 4.486 1768 B 2010 5.348 5.030 1768 C 2010 2.580 2.262 1768 D 2010 2.506 2.188 1768 E 2010 2.458 2.140
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9751768 PUBLICATION DATE: 11/18/2011 Name: RUY POINT, ST THOMAS VI NOAA Chart: 25641 Latitude: 18° 22.3' N ( 18.37125) USGS Quad: CENTRAL ST THOMAS Longitude: 64° 57.8' W ( -64.96347) 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.