U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8729022 PUBLICATION DATE: 11/13/2003
Name: ST. ANDREW SOUND, EAST END
FL
NOAA Chart: 11389 Latitude: 29° 58.2' N ( 29.97000)
USGS Quad: BEACON HILL Longitude: 85° 28.8' W ( -85.48000)
To reach the tidal bench marks from the intersection of U.S. Highway 98 and
County Road 386 in Mexico Beach, proceed west on U.S. Highway 98 for 7.1 km (4.4
mi) to Tyndall Air Force Base, then continue west on the main drive for 1.8 km
(1.1 mi) to the Directorate of Field Technology facility. The bench marks are
along the main drive leading to the facility. The tide gage and staff were
located on the east end of Tyndall Air Force Base Life Support Dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9022 A 1976
DESIGNATION: 872 9022 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9949
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0867
SETTING CLASSIFICATION: Concrete stairway OPUS PID:
LATITUDE: 29° 58.1' N ( 29.96830) LONGITUDE: 85° 28.4' W ( -85.47330)
The primary bench mark is a disk set flush in the south side of a concrete
stairway on the west side of the main building at the Directorate of Field
Technology facility, 58 m (190 ft) NNW of bench mark SOUND 1956, 21 m (70 ft)
NNW of the centerline of a circular drive, 0.26 m (0.85 ft) north of the south
side of the stairs, and 0.20 m (0.65 ft) west of the west edge of the stairs.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8729022 PUBLICATION DATE: 11/13/2003
Name: ST. ANDREW SOUND, EAST END
FL
NOAA Chart: 11389 Latitude: 29° 58.2' N ( 29.97000)
USGS Quad: BEACON HILL Longitude: 85° 28.8' W ( -85.48000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SOUND 1956
DESIGNATION: SOUND
MONUMENTATION: Triangulation Station disk VM#: 9947
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AS0005
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 58.0' N ( 29.96670) LONGITUDE: 85° 28.4' W ( -85.47330)
The bench mark is a disk set in the top of a concrete monument in front of the
main building at the facility, 47.40 m (155.5 ft) SW of the SE corner of the
building, 10.82 m (35.5 ft) north of the centerline of the main drive leading to
the facility, 27.01 m (88.6 ft) west of reference mark SOUND NO 1 1956, 0.76 m
(2.5 ft) SE of a wooden witness post, level with the road, and 6 cm (0.2 ft)
above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8729022 PUBLICATION DATE: 11/13/2003
Name: ST. ANDREW SOUND, EAST END
FL
NOAA Chart: 11389 Latitude: 29° 58.2' N ( 29.97000)
USGS Quad: BEACON HILL Longitude: 85° 28.8' W ( -85.48000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E 1000 1961
DESIGNATION: E 1000
MONUMENTATION: Bench Mark disk VM#: 9948
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AS0866
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 58.1' N ( 29.96830) LONGITUDE: 85° 28.3' W ( -85.47170)
The bench mark is a disk set flush in a concrete monument, about 107 m (350 ft)
NE of the shoreline, 19.72 m (64.7 ft) north of the centerline of the main drive
leading to the facility, 0.3 m (1 ft) south of a wooden witness post with a
witness sign attached, and 6 cm (0.2 ft) below ground level.
BENCH MARK STAMPING: 9022 F 1985
DESIGNATION: 872 9022 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 17171
AGENCY: National Ocean Service (NOS) IDB PID#: AS0865
SETTING CLASSIFICATION: Concrete culvert headwall OPUS PID#: AS0865
LATITUDE: 29° 58.2' N ( 29.97000) LONGITUDE: 85° 27.9' W ( -85.46500)
The benchmark is set in the top of a concrete culvert headwall, 0.6 km (0.4 mi)
south of the junction of the paved road and U.S Highway 98, 4.9 m (16 ft) west
of the centerline of the road, 18.7 m (61.2 ft) SW of and across the road from
powerline pole #1082, 15 cm (0.5 ft) south of the north end of the headwall, and
0.3 m (1 foot) above the level of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8729022 PUBLICATION DATE: 11/13/2003
Name: ST. ANDREW SOUND, EAST END
FL
NOAA Chart: 11389 Latitude: 29° 58.2' N ( 29.97000)
USGS Quad: BEACON HILL Longitude: 85° 28.8' W ( -85.48000)
T I D A L D A T U M S
Tidal datums at ST. ANDREW SOUND, EAST END 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 = 0.431
MEAN HIGH WATER MHW = 0.389
MEAN TIDE LEVEL MTL = 0.217
MEAN SEA LEVEL MSL = 0.214
North American Vertical Datum NAVD88 = 0.185
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
9022 A 1976 3.109 2.720
SOUND 1956 1.687 1.298
E 1000 1961 1.965 1.576
9022 F 1985 1.974 1.585
Foot Notes:
Bench mark 9022 F 1985 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 5 of 5
Station ID: 8729022 PUBLICATION DATE: 11/13/2003
Name: ST. ANDREW SOUND, EAST END
FL
NOAA Chart: 11389 Latitude: 29° 58.2' N ( 29.97000)
USGS Quad: BEACON HILL Longitude: 85° 28.8' W ( -85.48000)
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.