U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8729052 PUBLICATION DATE: 11/13/2003
Name: ST ANDREW SOUND
FL
NOAA Chart: 11389 Latitude: 30° 1.5' N ( 30.02500)
USGS Quad: LONG POINT Longitude: 85° 32.5' W ( -85.54170)
To reach the tidal bench marks from the entrance to Tyndall Air Force Base,
proceed SE on U.S. Highway 98 for 7.0 km (4.4 mi) to the Tyndall Air Force Base
Drone Launch Site. The bench marks are located in area around the Drone Launch
Site. The tide gage and staff were located on a platform offshore.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: A 175 1957
DESIGNATION: A 175
MONUMENTATION: Bench Mark disk VM#: 9958
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BE0840
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 1.8' N ( 30.03000) LONGITUDE: 85° 32.3' W ( -85.53830)
The primary bench mark is a disk set in the top of a concrete monument, 151 m
(495 ft) SE of the junction of an oiled road leading NE, 35 m (114 ft) west of
telephone pole #437, 20.7 m (68 ft) SW of the centerline of the highway, 19 m
(61 ft) east of power pole #922, 7 m (22 ft) NE of the centerline of a track
road leading SW, 0.46 m (1.5 ft) SW of a steel witness post, and 3 cm (0.1 ft)
above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8729052 PUBLICATION DATE: 11/13/2003
Name: ST ANDREW SOUND
FL
NOAA Chart: 11389 Latitude: 30° 1.5' N ( 30.02500)
USGS Quad: LONG POINT Longitude: 85° 32.5' W ( -85.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: F2-2H 1975
DESIGNATION: F 2 2 H USE
MONUMENTATION: Survey disk VM#: 9959
AGENCY: USE IDB PID#: BE3032
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 1.9' N ( 30.03170) LONGITUDE: 85° 32.4' W ( -85.54000)
The bench mark is a disk set in the top of a concrete monument, 148 m (487 ft)
NW of bench mark A 175 1957, 14.48 m (47.5 ft) SW of the centerline of U.S.
Highway 98, 11 m (36 ft) SE of a powerline pole with a U.S.E. witness sign, and
3.23 m (10.6 ft) SE of the centerline of a dirt drive leading SW along the SE
side of the drone launch facility, 0.3 m (1 ft) NE of a witness post, and at
ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8729052 PUBLICATION DATE: 11/13/2003
Name: ST ANDREW SOUND
FL
NOAA Chart: 11389 Latitude: 30° 1.5' N ( 30.02500)
USGS Quad: LONG POINT Longitude: 85° 32.5' W ( -85.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: F2-2J 1975
DESIGNATION: F 2 2 J USE
MONUMENTATION: Survey disk VM#: 9960
AGENCY: USE IDB PID#: BE3031
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 1.7' N ( 30.02830) LONGITUDE: 85° 32.1' W ( -85.53500)
The bench mark is a disk set in the top of a concrete monument, 390 m (1280 ft)
ESE of and across the highway from bench mark A 175 1957, 38 m (126 ft) east of
the intersection of U.S. Highway 98 and a dirt drive leading SW to the Sound,
20.39 m (66.9 ft) NE of the centerline of the highway, 2.13 m (7.0 ft) SW of a
pine tree with a U.S.E. witness sign, and 12 cm (0.4 ft) above ground level.
BENCH MARK STAMPING: 9052 A 1976
DESIGNATION: 872 9052 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9961
AGENCY: National Ocean Survey (NOS) IDB PID#: BE3033
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 1.5' N ( 30.02500) LONGITUDE: 85° 32.5' W ( -85.54170)
The bench mark is a disk located 656 m (2152 ft) SW of the centerline of U.S.
Highway 98, 27.43 m (90.0 ft) north of the shoreline, 5.18 m (17.0 ft) SW of the
centerline of the dirt drive along the SE side of the Drone Site, 21.24 m (69.7
ft) NW of a utility pole, 25.91 m (85.0 ft) NW of a "DANGER" sign, and 0.40 m
(1.3 ft) NNE of a witness post. The bench mark is crimped to the top of a
copper-clad steel rod driven 10 m (32 ft) to refusal, and encased in a PVC pipe
and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8729052 PUBLICATION DATE: 11/13/2003
Name: ST ANDREW SOUND
FL
NOAA Chart: 11389 Latitude: 30° 1.5' N ( 30.02500)
USGS Quad: LONG POINT Longitude: 85° 32.5' W ( -85.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9052 E 1984
DESIGNATION: 872 9052 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 9962
AGENCY: National Ocean Service (NOS) IDB PID#: BE3034
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 1.9' N ( 30.03170) LONGITUDE: 85° 32.4' W ( -85.54000)
The bench mark is a disk set in the top of a concrete monument, 35.45 m (116.3
ft) SW of the centerline of U.S. Highway 98, 11.25 m (36.9 ft) NNE of the north
fence corner of the drone facility, 0.76 m (2.5 ft) north of powerline pole
#919, and 6 cm (0.2 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8729052 PUBLICATION DATE: 11/13/2003
Name: ST ANDREW SOUND
FL
NOAA Chart: 11389 Latitude: 30° 1.5' N ( 30.02500)
USGS Quad: LONG POINT Longitude: 85° 32.5' W ( -85.54170)
T I D A L D A T U M S
Tidal datums at ST ANDREW SOUND based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: July 1976 - August 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8729015 ALLANTON, EAST BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.420
MEAN HIGH WATER MHW = 0.384
MEAN TIDE LEVEL MTL = 0.214
MEAN SEA LEVEL MSL = 0.206
North American Vertical Datum NAVD88 = 0.179
MEAN LOW WATER MLW = 0.044
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
A 175 1957 6.909 6.525
F2-2H 1975 6.857 6.473
F2-2J 1975 6.687 6.303
9052 A 1976 0.501 0.117
9052 E 1984 6.987 6.603
Foot Notes:
Bench mark 9052 E 1984 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving an elevation for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8729052 PUBLICATION DATE: 11/13/2003
Name: ST ANDREW SOUND
FL
NOAA Chart: 11389 Latitude: 30° 1.5' N ( 30.02500)
USGS Quad: LONG POINT Longitude: 85° 32.5' W ( -85.54170)
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.