U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 1890000 PUBLICATION DATE: 10/07/2011 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N ( 19.29000) USGS Quad: NONE Longitude: 166° 37.1' E ( 166.61800) To reach the tidal bench marks from the National Weather Service (NWS) office at the U.S. Army Base, exit the NWS parking lot, turn right onto Wake Highway, and proceed around the runway until the small boat channel is reached. The tide house is located at Building # 1711, a light green concrete block building located near the northern-most corner of the south seawall along the boat channel. The tidal bench marks are located in the vicinity. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 12 1961 DESIGNATION: 189 0000 TIDAL 12 ALIAS: 12 MONUMENTATION: Tidal Station disk VM#: 129 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: TW0169 SETTING CLASSIFICATION: Concrete apron OPUS PID: LATITUDE: 19° 17.4' N ( 19.28989) LONGITUDE: 166° 37.1' E ( 166.61861) The primary bench mark is set in the concrete apron at the easterly corner of the Boathouse (Building # 1709), 3.66 m (12.0 ft) SW of the boat basin wharf face, 0.30 m (1.0 ft) NW of the east edge of concrete apron, and 0.30 m (1.0 ft) SE of easterly corner of building. BENCH MARK STAMPING: NO 13 1965 DESIGNATION: 189 0000 TIDAL 13 MONUMENTATION: Tidal Station disk VM#: 130 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Concrete apron OPUS PID: LATITUDE: 19° 17.4' N ( 19.28997) LONGITUDE: 166° 37.1' E ( 166.61844) The bench mark is set in the concrete apron at the westerly corner of the Boathouse (Building # 1705), 14 m (45 ft) SW of the wharf face, 2.99 m (9.8 ft) NW of the center of the NW-most set of double doors on the west side of the boathouse, and 0.2 m (0.5 ft) SW of the westerly corner of the Boathouse.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 1890000 PUBLICATION DATE: 10/07/2011 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N ( 19.29000) USGS Quad: NONE Longitude: 166° 37.1' E ( 166.61800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 K 1978 DESIGNATION: 189 0000 TIDAL BM K MONUMENTATION: Tidal Station disk VM#: 136 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 19° 17.4' N ( 19.29056) LONGITUDE: 166° 37.0' E ( 166.61739) The bench mark is set in the south concrete seawall bordering the boat basin entrance channel, 16 m (54 ft) WSW of the most NE channel seawall corner, 8 m (27 ft) NE of the SW edge of the concrete seawall, and 0.3 m (1 ft) south of the north edge of the seawall. BENCH MARK STAMPING: 0000 L 1980 DESIGNATION: 189 0000 L MONUMENTATION: Tidal Station disk VM#: 137 AGENCY: National Ocean Survey (NOS) IDB PID#: DM7505 SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 19° 17.2' N ( 19.28708) LONGITUDE: 166° 37.2' E ( 166.61953) The bench mark is set in a 12 m x 32 m (41 ft x 105 ft) abandoned concrete pad overgrown with vines, 90 m (295 ft) WNW of bench mark 189 0000 J, 31.24 m (102.5 ft) NE of the centerline of the main road to the boathouse, 29.41 m (96.5 ft) north of the north corner of an orange underground cable station cover, 10.18 m (33.4 ft) south of the centerline of a dirt road adjacent to the pad, 6.83 m (22.4 ft) east of the north-most of two tall grey 3-inch diameter PVC posts, 0.61 m (2.0 ft) south of the NW edge of the pad, and 0.46 m (1.5 ft) east of the west edge of the pad.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 1890000 PUBLICATION DATE: 10/07/2011 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N ( 19.29000) USGS Quad: NONE Longitude: 166° 37.1' E ( 166.61800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 N 1989 DESIGNATION: 189 0000 N MONUMENTATION: Tidal Station disk VM#: 139 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 19° 17.4' N ( 19.28983) LONGITUDE: 166° 37.1' E ( 166.61808) The bench mark is set in the foundation of Building # 1706 in the north doorway located south of the boat basin, 4.75 m (15.6 ft) east of the west side of doorway, 0.13 m (0.45 ft) west of the east side of the doorway, and 0.09 m (0.30 ft) south of north edge of the foundation. BENCH MARK STAMPING: 0000 P 1992 DESIGNATION: 189 0000 P MONUMENTATION: Tidal Station disk VM#: 6425 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 19° 17.2' N ( 19.28725) LONGITUDE: 166° 37.0' E ( 166.61717) The bench mark is set in the east end of a concrete seawall, 100 m (328 ft) south of Building #1715, 64 m (210 ft) south of middle of road leading to east jetty, 34 m (110 ft) north of the high water line, 3.35 m (11.0 ft) north of the east elbow of seawall, and 0.76 m (2.5 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 1890000 PUBLICATION DATE: 10/07/2011 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N ( 19.29000) USGS Quad: NONE Longitude: 166° 37.1' E ( 166.61800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 R 1994 DESIGNATION: 189 0000 R MONUMENTATION: Tidal Station disk VM#: 6446 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 19° 17.3' N ( 19.28844) LONGITUDE: 166° 37.0' E ( 166.61633) The bench mark is set flush in top of a 4 m x 2 m (14 ft x 6 ft) concrete foundation, 82 m (270 ft) south of Building # 1716, 43 m (142 ft) SE of the SW corner of a WWII concrete pillbox, 29 m (96 ft) SW of a large circular concrete fuel tank foundaiton which no longer has a tank on it, 23 m (75 ft) NE of the center of the paved road leading to the east jetty, 0.76 m (2.5 ft) SW of the NE side of the foundation, 0.76 m (2.5 ft) SE of the NE side of the foundation, and 0.3 m (1 ft) above grade. BENCH MARK STAMPING: 0000 S 2003 DESIGNATION: 189 0000 S MONUMENTATION: Tidal Station disk VM#: 17107 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 19° 17.3' N ( 19.28792) LONGITUDE: 166° 37.1' E ( 166.61850) The bench mark is set flush in the most westerly corner of a 12 m x 30 m (40 ft x 100 ft) concrete pad SE of the small boat harbor, 30.4 m (100 ft) south of a green electrical concrete vault cover, 22.20 m (73 ft) east of the center of a three way triangular road intersection, 1.10 m (3.6 ft) SE of the NW edge of the concrete pad, and 0.79 m (2.6 ft) NE of the SW edge of the concrete pad.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 1890000 PUBLICATION DATE: 10/07/2011 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N ( 19.29000) USGS Quad: NONE Longitude: 166° 37.1' E ( 166.61800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 U 2005 DESIGNATION: 189 0000 U MONUMENTATION: Tidal Station disk VM#: 17994 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bulkhead OPUS PID: LATITUDE: 19° 17.4' N ( 19.29028) LONGITUDE: 166° 37.1' E ( 166.61814) The bench mark is set flush in the top of the concrete bullrail on the SE side of the harbor on Wake Island, 72 m (236 ft) SE of the NW end of the bullrail, 64.67 m (212.7 ft) NW of the NE end of the bullrail, 3.24 m (10.6 ft) NE of the electric meter, 0.81 m (2.7 ft) SW of the pier face, and 0.3 m (1.0 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 1890000 PUBLICATION DATE: 10/07/2011 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N ( 19.29000) USGS Quad: NONE Longitude: 166° 37.1' E ( 166.61800) T I D A L D A T U M S Tidal datums at WAKE ISLAND, 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 (08/31/2006) = 1.819 MEAN HIGHER HIGH WATER MHHW = 0.717 MEAN HIGH WATER MHW = 0.653 MEAN SEA LEVEL MSL = 0.346 MEAN TIDE LEVEL MTL = 0.345 MEAN LOW WATER MLW = 0.037 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (10/19/1968) = -0.652 Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 12 1961 3.091 2.438 NO 13 1965 3.177 2.524 0000 K 1978 3.425 2.772 0000 L 1980 4.090 3.437 0000 N 1989 3.880 3.227 0000 P 1992 3.968 3.315 0000 R 1994 3.430 2.777 0000 S 2003 3.707 3.054 0000 U 2005 3.177 2.524
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 1890000 PUBLICATION DATE: 10/07/2011 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N ( 19.29000) USGS Quad: NONE Longitude: 166° 37.1' E ( 166.61800) 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 local island datum. 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. 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/.