U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8725488 PUBLICATION DATE: 10/21/2010
Name: NORTH CAPTIVA ISLAND
FL
NOAA Chart: 11426 Latitude: 26° 36.3' N ( 26.60500)
USGS Quad: CAPTIVA Longitude: 82° 13.1' W ( -82.21830)
To reach the tidal bench marks from the Bocilla Yacht Club boat ramp on Bokeelia
Island, proceed by boat west along the channel of Jug Creek for 3 km (2 mi) to
the day beacon in Charlotte Harbor, then go SSW along the marked channel in Pine
Island Sound for 13 km (8 mi) to the north end of North Captiva Island. The
bench marks are on the NE side of the north end of the island, along Kingfisher
and Morning Dove Drives. The tide gage and staff were at the east end of a
private pier built on Lot #9 of the North Captiva Sands Subdivision.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5488 F 1978
DESIGNATION: 872 5488 F
MONUMENTATION: Tidal Station disk VM#: 7348
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 36.3' N ( 26.60500) LONGITUDE: 82° 13.1' W ( -82.21830)
The primary bench mark is a disk located 91 m (300 ft) north of the north side
of an airstrip where it meets Morning Dove Drive, 19.81 m (65.0 ft) NE of the NE
corner of the Dixon residence, and 2 m (7 ft) east of the centerline of Morning
Dove Drive. The bench mark is crimped to the top of a copper-clad steel rod
driven 6.1 m (20 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 2 of 5
Station ID: 8725488 PUBLICATION DATE: 10/21/2010
Name: NORTH CAPTIVA ISLAND
FL
NOAA Chart: 11426 Latitude: 26° 36.3' N ( 26.60500)
USGS Quad: CAPTIVA Longitude: 82° 13.1' W ( -82.21830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5488 G 1989
DESIGNATION: 872 5488 G
MONUMENTATION: Tidal Station disk VM#: 7349
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 36.3' N ( 26.60500) LONGITUDE: 82° 13.1' W ( -82.21830)
The bench mark is a disk located 53.49 m (175.5 ft) NW of bench mark 5488 H
1989, 18.59 m (61.0 ft) WSW of the SW corner of the house on Lot 3-Block 5, and
27.43 m (9.0 ft) SW of the centerline of Kingfisher Drive. The bench mark is
crimped to the top of a copper-clad steel rod driven 8.5 m (28 ft) to refusal,
and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5488 H 1989
DESIGNATION: 872 5488 H
MONUMENTATION: Tidal Station disk VM#: 7350
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 36.3' N ( 26.60500) LONGITUDE: 82° 13.1' W ( -82.21830)
The bench mark is a disk located 33.16 m (108.8 ft) NW of bench mark 5488 J
1989, 12.59 m (41.3 ft) WNW of the SW corner of the house at Lot G, and 3.26 m
(10.7 ft) SW of the centerline of Kingfisher Drive. The bench mark is crimped
to the top of a copper- clad steel rod driven 6.4 m (21 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 3 of 5
Station ID: 8725488 PUBLICATION DATE: 10/21/2010
Name: NORTH CAPTIVA ISLAND
FL
NOAA Chart: 11426 Latitude: 26° 36.3' N ( 26.60500)
USGS Quad: CAPTIVA Longitude: 82° 13.1' W ( -82.21830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5488 J 1989
DESIGNATION: 872 5488 J
MONUMENTATION: Tidal Station disk VM#: 7351
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 36.3' N ( 26.60500) LONGITUDE: 82° 13.1' W ( -82.21830)
The bench mark is a disk located 32 m (105 ft) NE of bench mark 5488 K 1989, and
11 m (35 ft) south of the fork in the road formed by Kingfisher and Morning Dove
Drives. The bench mark is crimped to the top of a copper-clad steel rod driven
6.7 m (22 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5488 K 1989
DESIGNATION: 872 5488 K
MONUMENTATION: Tidal Station disk VM#: 7352
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 36.3' N ( 26.60500) LONGITUDE: 82° 13.1' W ( -82.21830)
The bench mark is a disk located 70 m (231 ft) NW of bench mark 5488 F 1978, and
4.11 m (13.5 ft) west of the centerline of Morning Dove Drive. The bench mark
is crimped to the top of a copper-clad steel rod driven 6.4 m (21 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 5
Station ID: 8725488 PUBLICATION DATE: 10/21/2010
Name: NORTH CAPTIVA ISLAND
FL
NOAA Chart: 11426 Latitude: 26° 36.3' N ( 26.60500)
USGS Quad: CAPTIVA Longitude: 82° 13.1' W ( -82.21830)
T I D A L D A T U M S
Tidal datums at NORTH CAPTIVA ISLAND based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: July 1989 - August 1989
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.615
MEAN HIGH WATER MHW = 0.554
MEAN TIDE LEVEL MTL = 0.319
MEAN SEA LEVEL MSL = 0.319
MEAN LOW WATER MLW = 0.083
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5488 F 1978 0.850 0.296
5488 G 1989 0.663 0.109
5488 H 1989 0.792 0.238
5488 J 1989 0.553 -0.001
5488 K 1989 0.875 0.321
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8725488 PUBLICATION DATE: 10/21/2010
Name: NORTH CAPTIVA ISLAND
FL
NOAA Chart: 11426 Latitude: 26° 36.3' N ( 26.60500)
USGS Quad: CAPTIVA Longitude: 82° 13.1' W ( -82.21830)
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.