U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
To reach the tidal bench marks from the intersection of U.S. Highway 1 and 17th
Street in Vero Beach, go east on 17th Street for 1.13 km (0.7 mi) to the
intersection of Indian River Boulevard, turn left on Indian River Boulevard and
go north for about 60.96 m (200.0 ft) to the main entrance road to the Vero
Beach Municipal power plant on the right. To reach the tide gage turn right on
the min entrance road and go east for 0.40 km (0.25 mi) to the boat ramp, now by
boat go SE about 0.48 km (0.3 mi). The Tide gage is attached to the SW end of
the west bridge fender.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1972
DESIGNATION: 872 2125 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 5411
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AF6802
SETTING CLASSIFICATION: Retaining wall OPUS PID#: AF6802
LATITUDE: 27° 38.0' N ( 27.63250) LONGITUDE: 80° 22.6' W ( -80.37611)
The bench mark is a disk set flush in the top of the north retaining wall of the
water intake structure about 0.61 m (2.0 ft) above the level of the ground,
59.34 m (194.7 ft) SW of a fire hydrant, 52.21 m (171.3 ft) SE of another fire
hydrant, 26.94 m (88.4 ft) south of the approximate centerline of the power
plant main entrance road, 24.84 m (81.5 ft) SSW of tidal mark NO 2 1972 and 0.15
m (0.5 ft) north of the south face of the water intake structures north
retaining wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1972
DESIGNATION: 872 2125 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 5412
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AF6801
SETTING CLASSIFICATION: Large concrete seawall OPUS PID#: AF6801
LATITUDE: 27° 38.0' N ( 27.63250) LONGITUDE: 80° 22.6' W ( -80.37611)
The bench mark is a disk set flush in the top of the NW corner of the concrete
seawall of the oil barge basin and about level with the entrance road, 51.66 m
(169.5 ft) east of a fire hydrant, 34.50 m (113.2 ft) WSW of another fire
hydrant, 24.84 m (81.5 ft) NNE of tidal mark NO 1 1972, 3.11 m (10.2 ft) south
of the approximate centerline of the power plants main entrance road and 1.34 m
(4.4 ft) SW of a 0.30 m (1.0 ft) wide x 0.58 m (1.9 ft) tall bollard.
BENCH MARK STAMPING: 2125 C 1980
DESIGNATION: 872 2125 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 5415
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: AF6933
SETTING CLASSIFICATION: Guardrail OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63194) LONGITUDE: 80° 22.5' W ( -80.37583)
The bench mark is a disk set flush in the top of the south guardrail of the 17th
Street Bridge 0.91 m (3.0 ft) above the level of the road, 76.2 m (250.0 ft)
east of bench mark 2125 D 1995, 13.96 m (45.8 ft) SSW of the first street light
on the west side of the eastbound lanes of 17th Street, 7.13 m (23.4 ft) south
of the approximate centerline of 17th Street (eastbound 2 lanes) and 0.34 m (1.1
ft) east of the SW end of the 17th Street Bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2125 D 1995
DESIGNATION: 872 2125 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 17747
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge memorial monument OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63194) LONGITUDE: 80° 22.7' W ( -80.37861)
The bench mark is a disk set in the top of the SW corner of the base of the 17th
Street Bridge concrete memorial about 0.30 m (1.0 ft) above the level of 17th
Street, 29.32 m (96.2 ft) east of the approximate centerline of Indian River
Boulevard, 12.56 m (41.2 ft) south of the approximate centerline of 17th Street,
12.13 m (39.8 ft) NE of a fire hydrant, 4.66 m (15.3 ft) west of an 2.44 m (8.0
ft) tall chain link fence, 1.52 m (5.0 ft) east of a concrete power pole, and
0.18 m (0.6 ft) north of a carsonite witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2125 E 1995
DESIGNATION: 872 2125 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 17748
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DM4024
LATITUDE: 27° 38.0' N ( 27.63250) LONGITUDE: 80° 22.7' W ( -80.37889)
The bench mark is a stainless steel rod located 26.00 m (85.3 ft) east of the
approximate centerline of Indian River Boulevard, 13.62 m (44.7 ft) SE of a
concrete power pole, 11.34 m (37.2 ft) SE of an electrical manhole cover, 8.02 m
(26.3 ft) north of the approximate centerline of the power plant main entrance
road, 1.89 m (6.2 ft) NE of a wooden power pole number 209A, 1.52 m (5.0 ft)
west of a 2.44 m (8.0 ft) tall chain link fence, and 0.30 m (1.0 ft) west of a
carsonite witness post. The bench mark is a stainless steel rod driven to
refusal at a depth of 23.77 m (78.0 ft) with a NGS logo cap recessed 0.06 m (0.2
ft) below the level of the ground and below the level of Indian River Boulevard,
the datum point being accessed through a 5-inch NGS logo cap and recessed 0.09 m
(0.3 ft) below the level of the NGS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2125 F 1995
DESIGNATION: 872 2125 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 17749
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 38.0' N ( 27.63389) LONGITUDE: 80° 22.5' W ( -80.37528)
The bench mark is a stainless steel rod located 170.69 m (560.0 ft) NE of tidal
mark NO 2 1972, about 91.44 m (300.0 ft) NE of the NW corner of the cooling
tower, about 84.43 m (277.0 ft) NE of the NE corner of the cooling tower, about
63.70 m (209.0 ft) NE of a fire hydrant, 4.72 m (15.5 ft) west of the west bank
of the Indian River and 0.91 m (3.0 ft) SW of the NE corner of a 2.44 m (8.0 ft)
tall chain link fence. The bench mark is a stainless steel rod driven to
refusal at a depth of 21.64 m (71.0 ft) with a NOS logo cap flush with the
ground, the datum point being accessed through a 5-inch logo cap and recessed
0.09 m (0.3 ft) below the level of the NOS logo cap.
BENCH MARK STAMPING: 2125 G 1995
DESIGNATION: 872 2125 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 17750
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge piling base OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63222) LONGITUDE: 80° 22.5' W ( -80.37472)
The bench mark is a disk set in the top of the NE corner of the most northern
piling base of the 3rd piling, starting from the west side of the bridge,
projecting about 0.61 m (2.0 ft) above the level of the Indian River, 56.08 m
(184.0 ft) west of bench mark 2125 H 1995, 3.44 m (11.3 ft) east of the NW
corner of the piling base, 2.01 m (6.6 ft) north of the SE corner of the piling
base, 0.94 m (3.1 ft) NE of the NE piling face and 0.82 m (2.7 ft) SW of the NE
corner of the piling base. NOTE: Access to the mark is by boat.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2125 H 1995
DESIGNATION: 872 2125 H TIDAL
MONUMENTATION: Tidal Station disk VM#: 17751
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge piling base OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63222) LONGITUDE: 80° 22.5' W ( -80.37417)
The bench mark is a disk set in the top of the NE corner of the most northern
piling base of the 5th piling, starting from the west side of the bridge,
projecting about 0.61 m (2.0 ft) above the level of the Indian River, 56.08 m
(184.0 ft) west of bench mark 2125 J 1995, 3.08 m (10.1 ft) east of the NW
corner of the piling base, 2.71 m (8.9 ft) north of the SE corner of the piling
base, 1.10 m (3.6 ft) NE of the NE piling face and 0.98 m (3.2 ft) SW of the NE
corner of the piling base. NOTE: Access to the mark is by boat.
BENCH MARK STAMPING: 2125 J 1995
DESIGNATION: 872 2125 J TIDAL
MONUMENTATION: Tidal Station disk VM#: 17752
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge piling base OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63222) LONGITUDE: 80° 22.4' W ( -80.37361)
The bench mark is a disk set in the top of the NE corner of the most northern
piling base of the 7th piling, starting from the west side of the bridge,
projecting about 0.61 m (2.0 ft) above the level of the Indian River, 56.08 m
(184.0 ft) west of bench mark 2125 K 1995, 3.35 m (11.0 ft) north of the SE
corner of the piling base, 2.77 m (9.1 ft) SE of the NW corner of the piling
base, 1.01 m (3.3 ft) NE of the NE piling face, and 0.88 m (2.9 ft) SW of the NE
corner of the piling base. NOTE: Access to mark is by boat.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2125 K 1995
DESIGNATION: 872 2125 K TIDAL
MONUMENTATION: Tidal Station disk VM#: 17753
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge piling base OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63222) LONGITUDE: 80° 22.4' W ( -80.37306)
The primary bench mark is a disk set in the top of the NE corner of the most
northern piling base of the 9th piling, starting from the west side of the
bridge, projecting about 0.61 m (2.0 ft) above the level of the Indian River
56.08 m (184.0 ft) west of bench mark 2125 L 1995, 3.38 m (11.1 ft) east of the
NW corner of the piling base, 2.74 m (9.0 ft) north of the SE corner of the
piling base, 0.98 m (3.2 ft) NE of the NE piling face, and 0.91 m (3.0 ft) SW of
the NE corner of the piling base. NOTE: Access to the mark is by boat.
BENCH MARK STAMPING: 2125 L 1995
DESIGNATION: 872 2125 L TIDAL
MONUMENTATION: Tidal Station disk VM#: 17754
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge piling base OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63222) LONGITUDE: 80° 22.4' W ( -80.37250)
The bench mark is a disk set in the top of the NE corner of the most northern
piling base of the 11th piling, starting from the west side of the bridge,
projecting about 0.61 m (2.0 ft) above the level of the Indian River, 56.08 m
(184.0 ft) west of bench mark 2125 m 1995, 3.47 m (11.4 ft) east of the NW
corner of the piling base, 2.74 m (9.0 ft) north of the SE corner of the piling
base, 1.13 m (3.7 ft) NE of the NE piling face, and 0.82 m (2.7 ft) SW of the NE
corner of the piling base. NOTE: Access to the mark is by boat.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2125 M 1995
DESIGNATION: 872 2125 M TIDAL
MONUMENTATION: Tidal Station disk VM#: 17755
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bridge piling base OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63222) LONGITUDE: 80° 22.3' W ( -80.37194)
The bench mark is a disk set in the top of the NE corner of the most northern
piling base of the 13th piling, starting from the west side of the bridge,
projecting about 0.61 m (2.0 ft) above the level of the Indian River 56.08 m
(184.0 ft) east of bench mark 2125 L 1995, about 28.65 m (94.0 ft) SW of
872-2125 aqua trak (tidal gage), 3.35 m (11.0 ft) east of the NW corner of the
piling base, 2.74 m (9.0 ft) north of the SW corner of the piling base, 1.07 m
(3.5 ft) SW of the NE corner of the piling base and 1.01 m (3.3 ft) NE of the NE
piling face. NOTE: Access to the mark is by boat.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: IND. R. 1 1979 CLB
DESIGNATION: IND R 1 FLDNR
MONUMENTATION: Bench Mark disk VM#: 19495
AGENCY: FL Department of Natural Resources
(FLDNR) IDB PID#: AF6800
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 27° 37.9' N ( 27.63194) LONGITUDE: 80° 23.1' W ( -80.38556)
The bench mark is a disk located 5.85 m (19.2 ft) south of 17th Street eastbound
lane centerline, 16.31 m (53.5 ft) west of the 6th Avenue centerline, 2.93 m
(9.6 ft) west of a concrete traffic light pole (CVB-50954), 7.47 m (24.5 ft) WNW
of a steel power pole, and 2.13 m (7.0 ft) N from a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: W 200 1960
DESIGNATION: W 200
MONUMENTATION: Bench Mark disk VM#: 19496
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AF3371
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 27° 38.5' N ( 27.64222) LONGITUDE: 80° 23.3' W ( -80.38889)
The bench mark is 8.38 m (27.5 ft) north of the north curb line of Royal Palm
Boulevard, 10.97 m (36.0 ft) east of the center line of the junction of Royal
Palm Boulevard and 8th Avenue, 3.35 m (11.0 ft) NNW of the first palm tree east
of the junction, 0.61 m (2.0 ft) NE of the extended center line of the west
drive leading to the Royal Palm court, 0.61 m (2.0 ft) west of a steel witness
post, about 0.30 m (1.0 ft) below the level of the Boulevard, about level with
the graded road, and set in top of a concrete post projecting 5-inches.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 11 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
T I D A L D A T U M S
Tidal datums at VERO BEACH, INDIAN RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: April 1999 - June 1999
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720220 MAYPORT (FERRY DEPOT), SAINT JOHNS RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
North American Vertical Datum NAVD88 = 0.409
MEAN HIGHER HIGH WATER MHHW = 0.272
MEAN HIGH WATER MHW = 0.247
MEAN TIDE LEVEL MTL = 0.133
MEAN SEA LEVEL MSL = 0.131
MEAN LOW WATER MLW = 0.019
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1972 2.408 2.161
NO 2 1972 2.090 1.843
2125 C 1980 4.722 4.475
2125 D 1995 2.233 1.986
2125 E 1995 1.639 1.392
2125 F 1995 1.303 1.056
2125 G 1995 0.999 0.752
2125 H 1995 0.964 0.717
2125 J 1995 0.961 0.714
2125 K 1995 0.966 0.719
2125 L 1995 0.938 0.691
2125 M 1995 0.920 0.673
IND. R. 1 1979 CLB 1.853 1.606
W 200 1960 2.056 1.809
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 12 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
Foot Notes:
Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling. It is advised that a confirmation
set of levels be established for bench marks 2125 C 1980, 2125 D 1995, 2125 E
1995, 2125 F 1995, 2125 G 1995, 2125 H 1995, 2125 J 1995, IND. R.1 1979 CLB, and
W 200 1960 to verify height differences before using tidal bench mark elevation
information.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 13 of 13
Station ID: 8722125 PUBLICATION DATE: 05/08/2012
Name: VERO BEACH, INDIAN RIVER
FL
NOAA Chart: 11474 Latitude: 27° 37.9' N ( 27.63170)
USGS Quad: VERO BEACH Longitude: 80° 22.3' W ( -80.37170)
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 the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships 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/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 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, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.