U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 1630000 PUBLICATION DATE: 06/27/2017 Name: APRA HARBOR, GUAM, PACIFIC OCEAN UNITED STATES OF AMERICA NOAA Chart: 81054 Latitude: 13° 26.3' N ( 13.43872) USGS Quad: APRA HARBOR Longitude: 144° 39.2' E ( 144.65394) To reach the tidal bench marks, from the Guam airport, travel east on Chalan Passajeros (Route 10A) for 2.9 km (1.8 mi) until you reach the main gate of the Naval Station Guam. Obtain a visitor's pass and continue on Marine Drive for 2.9 km (1.8 mi) until you reach San Luis Road, turn right (east) and follow the boat channel on your right to its entrance. The bench marks are located between Small Boat Channel and Fleet Landing Channel. The tide house is located on the east corner of the entrance to the Sunny Cove Marina boat harbor. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 6 1949 DESIGNATION: 163 0000 TIDAL 6 MONUMENTATION: Tidal Station disk VM#: 1686 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: TW0043 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 13° 26.3' N ( 13.43881) LONGITUDE: 144° 39.2' E ( 144.65344) The primary bench mark is set in top of the S end of a concrete culvert headwall on the S side of San Luis Road, 95.40 m (313.0 ft) S of bench mark NO 5 1949, 82.30 m (270.0 ft) E of the centerline of Marine Drive, 12.19 m (40.0 ft) S of the centerline of San Luis Road, and 9.14 m (30.0 ft) N of telephone pole 2-H-22-6-19-2. BENCH MARK STAMPING: TIDAL BM 13 1975 DESIGNATION: 163 0000 TIDAL BM 13 MONUMENTATION: Tidal Station disk VM#: 1690 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete apron slab OPUS PID: LATITUDE: 13° 26.3' N ( 13.43903) LONGITUDE: 144° 39.1' E ( 144.65219) The bench mark is set in the concrete apron fronting the double door entrance to the Communication Security Material Issuing office, 70 m (230 ft) NW of the centerline of the intersection of San Luis Road and Marine Drive, 42 m (139 ft) W of a fire hydrant, 7 m (24 ft) N of the S wall of the office, and 0.85 m (2.8 ft) E of the office.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 1630000 PUBLICATION DATE: 06/27/2017 Name: APRA HARBOR, GUAM, PACIFIC OCEAN UNITED STATES OF AMERICA NOAA Chart: 81054 Latitude: 13° 26.3' N ( 13.43872) USGS Quad: APRA HARBOR Longitude: 144° 39.2' E ( 144.65394) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 163 0000 TIDAL 7 ALIAS: TIDAL 7 PIE MONUMENTATION: Bolt VM#: 1693 AGENCY: Unknown IDB PID#: TW0044 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 13° 26.3' N ( 13.43844) LONGITUDE: 144° 39.2' E ( 144.65264) The bench mark is a bolt set flush in the N end of a concrete culvert headwall at the SW corner of the intersection of Marine Drive and San Luis Road, 21.34 m (70.0 ft) S of the centerline of San Luis Road, 10.97 m (36.0 ft) W of the centerline of Marine Drive, and about 4 m (12 ft) N of a protruding concrete post labeled "Buried Cable". BENCH MARK STAMPING: 0000 P 2006 DESIGNATION: 163 0000 P MONUMENTATION: Tidal Station disk VM#: 17897 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete steps OPUS PID: LATITUDE: 13° 26.3' N ( 13.43872) LONGITUDE: 144° 39.2' E ( 144.65397) The bench mark is set flush in the NE corner of a 2 m x 1 m (6 ft x 4 ft) landing of steps leading into the Sumay Cove Marina office located the W side of the Sumay Cove building, 6.90 m (20.0 ft) E of the NE corner of the marina building, 0.50 m (1.6 ft) NE of the NE end of the stair handrail, 0.20 m (0.5 ft) SE of the NW edge of the 2 m x 1 m (6 ft x 4 ft) concrete landing of the stairs, and 0.10 m (0.4 ft) NE of the NE end of the SW cinder block retaining wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 1630000 PUBLICATION DATE: 06/27/2017 Name: APRA HARBOR, GUAM, PACIFIC OCEAN UNITED STATES OF AMERICA NOAA Chart: 81054 Latitude: 13° 26.3' N ( 13.43872) USGS Quad: APRA HARBOR Longitude: 144° 39.2' E ( 144.65394) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 R 2010 DESIGNATION: 163 0000 R MONUMENTATION: Tidal Station disk VM#: 19559 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete seawall OPUS PID: LATITUDE: 13° 26.4' N ( 13.44039) LONGITUDE: 144° 39.3' E ( 144.65444) The bench mark is set in the 1.2 m (4 ft) x 0.9 m (3 ft) concrete seawall on top of the sheet pile along the Small Boat Channel, 10.40 m (34 ft) N of Slip 13 utility outlet, 10.40 m (34 ft) W of the centerline of the San Luis Road, 2.7 m (9 ft) SSE of the telephone junction box marked "1C2 9 buried cable", and 6.40 m (21 ft) W of a water valve cover. BENCH MARK STAMPING: 0000 S 2013 DESIGNATION: 163 0000 S MONUMENTATION: Tidal Station disk VM#: 20669 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Large concrete sea wall. OPUS PID: LATITUDE: 13° 26.5' N ( 13.44231) LONGITUDE: 144° 39.3' E ( 144.65581) The bench mark is a disk set flush in a concrete seawall cap located on the eastern boundary of Sumay Cove Park, 139.50 m (457.7 ft) SW of the SE corner of tide station pad, 0.70 m (2.3 ft) NW of the E edge of the concrete seawall cap, and 0.30 m (1.0 ft) SE of the W edge of the concrete seawall cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 1630000 PUBLICATION DATE: 06/27/2017 Name: APRA HARBOR, GUAM, PACIFIC OCEAN UNITED STATES OF AMERICA NOAA Chart: 81054 Latitude: 13° 26.3' N ( 13.43872) USGS Quad: APRA HARBOR Longitude: 144° 39.2' E ( 144.65394) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 T 2013 DESIGNATION: 163 0000 T MONUMENTATION: Tidal Station disk VM#: 20670 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Large concrete sea wall. OPUS PID: LATITUDE: 13° 26.6' N ( 13.44275) LONGITUDE: 144° 39.4' E ( 144.65614) The bench mark is a disk set flush in a concrete seawall cap located on the eastern boundary of Sumay Cove Park, 78.30 m (256.9 ft) SSW of the SE corner of tide station pad, 0.70 m (2.3 ft) NW of the E edge of the concrete seawall cap, and 0.30 m (1.0 ft) SE of the W edge of the concrete seawall cap. BENCH MARK STAMPING: 0000 U 2013 DESIGNATION: 163 0000 U MONUMENTATION: Tidal Station disk VM#: 20671 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Large concrete sea wall. OPUS PID: LATITUDE: 13° 26.6' N ( 13.44319) LONGITUDE: 144° 39.4' E ( 144.65644) The bench mark is a disk set flush in a concrete seawall cap located on the eastern boundary of Sumay Cove Park, 22.80 m (74.8 ft) SE of the SE corner of tide station pad, 0.70 m (2.3 ft) NW of the E edge of the concrete seawall cap, and 0.30 m (1.0 ft) SE of the W edge of the concrete seawall cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 1630000 PUBLICATION DATE: 06/27/2017 Name: APRA HARBOR, GUAM, PACIFIC OCEAN UNITED STATES OF AMERICA NOAA Chart: 81054 Latitude: 13° 26.3' N ( 13.43872) USGS Quad: APRA HARBOR Longitude: 144° 39.2' E ( 144.65394) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 V 2013 DESIGNATION: 163 0000 V MONUMENTATION: Tidal Station disk VM#: 20672 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Large concrete sea wall. OPUS PID: LATITUDE: 13° 26.6' N ( 13.44375) LONGITUDE: 144° 39.4' E ( 144.65660) The bench mark is a disk set flush in a concrete seawall cap located in the NE corner of Sumay Cove Park, 42.90 m (140.8 ft) NE of the NE corner of tide station pad, 0.75 m (2.5 ft) S of the N edge of the concrete seawall cap, and 0.25 m (0.8 ft) W of the E edge of the concrete seawall cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 1630000 PUBLICATION DATE: 06/27/2017 Name: APRA HARBOR, GUAM, PACIFIC OCEAN UNITED STATES OF AMERICA NOAA Chart: 81054 Latitude: 13° 26.3' N ( 13.43872) USGS Quad: APRA HARBOR Longitude: 144° 39.2' E ( 144.65394) T I D A L D A T U M S Tidal datums at APRA HARBOR, GUAM, PACIFIC OCEAN based on: LENGTH OF SERIES: 19 YEARS TIME PERIOD: January 1983 - December 2001 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (08/28/1992) = 1.309 MEAN HIGHER HIGH WATER MHHW = 0.715 MEAN HIGH WATER MHW = 0.678 MEAN TIDE LEVEL MTL = 0.432 Guam Vertical Datum of 2004 GUVD04 = 0.423 MEAN SEA LEVEL MSL = 0.419 MEAN LOW WATER MLW = 0.185 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (10/24/1972) = -0.712 Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 6 1949 1.957 1.279 TIDAL BM 13 1975 3.265 2.587 163 0000 TIDAL 7 2.685 2.007 0000 P 2006 2.028 1.350 0000 R 2010 2.093 1.415 0000 S 2013 2.221 1.543 0000 T 2013 2.199 1.521 0000 U 2013 2.182 1.504 0000 V 2013 2.151 1.473
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 1630000 PUBLICATION DATE: 06/27/2017 Name: APRA HARBOR, GUAM, PACIFIC OCEAN UNITED STATES OF AMERICA NOAA Chart: 81054 Latitude: 13° 26.3' N ( 13.43872) USGS Quad: APRA HARBOR Longitude: 144° 39.2' E ( 144.65394) 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 (GUVD04). 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. Guam Vertical Datum of 2004 (GUVD04) 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 station 1630000 at Apra Harbor, Guam, was held fixed as the single initial constraint. GUVD04 replaces all previous height system as the national standard geodetic reference for heights on Guam. Bench mark elevations relative to GUVD04 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 GUVD04 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have GUVD04 elevations. The GUVD04 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, GUVD04 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from GUVD04 elevations listed for each bench mark in the NGS database.