U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9710441 PUBLICATION DATE: 06/28/2004
Name: SETTLEMENT POINT, GRAND BAHAMAS
BA
NOAA Chart: 11460 Latitude: 26° 42.6' N ( 26.71000)
USGS Quad: None Longitude: 78° 59.8' W ( -78.99670)
To reach the tidal bench marks from Freeport International Airport, proceed SW
on Kings Highway for approximately 50 km (31 miles) to the town of West End, and
continue through West End to Jack Tar Hotel Marina. The bench marks are on the
marina grounds in the vicinity of the marina office, bath house, and the turning
basin. The tide gauge was located at the NE end of the eastern slip of the
turning basin.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0441 A 1985
DESIGNATION: 971 0441 A
MONUMENTATION: Tidal Station disk VM#: 7923
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 26° 42.6' N ( 26.71000) LONGITUDE: 78° 59.8' W ( -78.99670)
The primary bench mark is a disk set flush in the top of the concrete seawall in
the NE corner of the turning basin, 31.42 m (103.1 ft ) west of the west side of
the marina entrance canal, 29.16 m (95.7 ft) NW of the NW corner of the
warehouse building, 10.39 m (34.1 feet) south of the north end of the sea wall,
and 0.3 m (1 ft) east of the west face of the seawall cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9710441 PUBLICATION DATE: 06/28/2004
Name: SETTLEMENT POINT, GRAND BAHAMAS
BA
NOAA Chart: 11460 Latitude: 26° 42.6' N ( 26.71000)
USGS Quad: None Longitude: 78° 59.8' W ( -78.99670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0441 B 1985
DESIGNATION: 971 0441 B
MONUMENTATION: Tidal Station disk VM#: 7924
AGENCY: National Ocean Service (NOS) IDB PID#: AB9250
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 26° 42.2' N ( 26.70330) LONGITUDE: 78° 59.5' W ( -78.99170)
The bench mark is a disk set flush in a concrete seawall in the SW corner of the
eastern shipping slip of the turning basin, 55.57 m (182.3 ft) NNE of the
westernmost gate post of the warehouse/commercial marina area, 12.68 m (41.6
ft) SE of the SE corner of the warehouse office building, 2.68 m (8.8 ft) north
of the SW corner of the retaining wall, and 0.3 m (1 ft) above the road surface.
BENCH MARK STAMPING: 0441 C 1985
DESIGNATION: 971 0441 C
MONUMENTATION: Tidal Station disk VM#: 7925
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 26° 42.6' N ( 26.71000) LONGITUDE: 78° 59.8' W ( -78.99670)
The bench mark is a disk set flush in the NW corner of the concrete base of a
gas sign at the marina fuel dock, 9.81 m (32.2 ft ) west of the seawall face on
the west side of the marina entrance canal at the fuel dock, 6.43 m (21.1 ft )
north of the southern seawall face in the marina, 5.15 m (16.9 ft ) south of the
SE corner of the marina fuel dock office, and 0.12 m (0.4 ft) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9710441 PUBLICATION DATE: 06/28/2004
Name: SETTLEMENT POINT, GRAND BAHAMAS
BA
NOAA Chart: 11460 Latitude: 26° 42.6' N ( 26.71000)
USGS Quad: None Longitude: 78° 59.8' W ( -78.99670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0441 D 1985
DESIGNATION: 971 0441 D
MONUMENTATION: Tidal Station disk VM#: 7926
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 26° 42.6' N ( 26.71000) LONGITUDE: 78° 59.8' W ( -78.99670)
The bench mark is a disk set flush in the SE corner of an abandoned concrete
tower base on the west side of the marina, 38.62 m (126.7 ft) north of the west
gate post of the marina entrance, 17.01 m (55.8 ft) south of the SE corner of
the bath house, 11.40 m (37.4 ft ) west of the west seawall face of the marina,
0.82 m (2.7 ft ) west of the west edge of the marina road pavement, and 0.18 m
(0.6 ft ) above ground level.
BENCH MARK STAMPING: 0441 E 1985
DESIGNATION: 971 0441 E
MONUMENTATION: Tidal Station disk VM#: 7927
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 26° 42.6' N ( 26.71000) LONGITUDE: 78° 59.8' W ( -78.99670)
The bench mark is a disk set flush in the top at the SW corner of an antenna
tower base at the west end of the marina office building, SE of the SW corner of
the chain link fence around the marina, 10.52 m (34.5 ft) north of the
centerline of the road, and 3.63 m (11.9 ft ) SSE of the SE corner of the marina
office building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9710441 PUBLICATION DATE: 06/28/2004
Name: SETTLEMENT POINT, GRAND BAHAMAS
BA
NOAA Chart: 11460 Latitude: 26° 42.6' N ( 26.71000)
USGS Quad: None Longitude: 78° 59.8' W ( -78.99670)
T I D A L D A T U M S
Tidal datums at SETTLEMENT POINT, GRAND BAHAMAS based on:
LENGTH OF SERIES: 15 YEARS
TIME PERIOD: January 1986 - December 2000
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/01/1987) = 1.351
MEAN HIGHER HIGH WATER MHHW = 0.934
MEAN HIGH WATER MHW = 0.861
MEAN SEA LEVEL MSL = 0.446
MEAN TIDE LEVEL MTL = 0.444
MEAN LOW WATER MLW = 0.027
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (03/20/1988) = -0.429
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0441 A 1985 1.964 1.103
0441 B 1985 1.990 1.129
0441 C 1985 1.861 1.000
0441 D 1985 2.148 1.287
0441 E 1985 2.569 1.708
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9710441 PUBLICATION DATE: 06/28/2004
Name: SETTLEMENT POINT, GRAND BAHAMAS
BA
NOAA Chart: 11460 Latitude: 26° 42.6' N ( 26.71000)
USGS Quad: None Longitude: 78° 59.8' W ( -78.99670)
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.