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National Ocean Service
Datums Page Page 1 of 5
Station ID: 8666918 PUBLICATION DATE: 05/23/2003
Name: HO-NO-WAH SCOUT CAMP, BOHICKET CR
SC
NOAA Chart: 11522 Latitude: 32° 37.5' N ( 32.62500)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.0' W ( -80.16670)
To reach the tidal benchmarks from the intersection of U.S. Highway 17 (Savannah
Highway) and Main Road, proceed south on Main Road for about 13 km (8 mi) to
Maybank Highway (Route 700), then turn right on Maybank Highway and proceed for
23 km (14 mi) to Route S-10-765 (Boy Scout Road), then turn left onto Route
S-10-765 and proceed 1.4 km (0.9 mi) to the Totem Pole gates of the Ho-No-Wah
Boy Scout Camp, proceeding down the dirt road for 1.0 km (0.6 mi) to the dock on
the left side of the road. The bench marks are on the camp property and along
the road to the dock. The tide station was on the dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6918 A 1982
DESIGNATION: 866 6918 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 6662
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2608
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 37.7' N ( 32.62830) LONGITUDE: 80° 10.0' W ( -80.16670)
The primary bench mark is a disk located just WSW of the camp director building,
72.63 m (238.3 ft) SSE of bench mark 6918 B 1982, 33.53 m (110.0 ft) ESE of the
centerline of the dirt road, 17.13 m (56.2 ft) NNW of the oak tree with a No
Trespassing sign located near the concrete boat ramp, and 1.07 m (3.5 ft) WSW of
the SW corner of the concrete house of the camp director. The bench mark is 12
cm (0.4 ft) below ground level, crimped to a stainless steel rod driven 12.2 m
(40 ft) to refusal and encased in PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8666918 PUBLICATION DATE: 05/23/2003
Name: HO-NO-WAH SCOUT CAMP, BOHICKET CR
SC
NOAA Chart: 11522 Latitude: 32° 37.5' N ( 32.62500)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.0' W ( -80.16670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6918 B 1982
DESIGNATION: 866 6918 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 6663
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2607
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 37.7' N ( 30.62830) LONGITUDE: 80° 10.0' W ( -80.16670)
The bench mark is a disk set flush in a concrete monument just south of the
amphitheater, 73.40 m (240.8 ft) SSE of bench mark 6918 C 1982, 44.14 m (144.8
ft) ENE of the centerline of the road, 26.12 m (85.7 ft) north of the light pole
with a power terminal, 12.25 m (40.2 ft) south of the south corner of a concrete
amphitheater, and at ground level.
BENCH MARK STAMPING: 6918 C 1982
DESIGNATION: 866 6918 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 6664
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2606
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 37.8' N ( 32.63000) LONGITUDE: 80° 10.0' W ( -80.16670)
The bench mark is a disk located 44.26 m (145.2 ft) SSE of bench mark 6918 D
1982, 5.61 m (18.4 ft) east of the centerline of the dirt road, 5.18 m (17.0 ft)
SW of the guy wire anchor, and 1.28 m (4.2 ft) east of power pole No 10 with a
witness sign. The bench mark is set 9 cm (0.3 ft) below ground level, crimped
to the top of a stainless steel rod driven 14.6 m (48 ft) to refusal and encased
in PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8666918 PUBLICATION DATE: 05/23/2003
Name: HO-NO-WAH SCOUT CAMP, BOHICKET CR
SC
NOAA Chart: 11522 Latitude: 32° 37.5' N ( 32.62500)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.0' W ( -80.16670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6918 D 1982
DESIGNATION: 866 6918 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 6665
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2605
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 37.8' N ( 32.63000) LONGITUDE: 80° 10.1' W ( -80.16830)
The bench mark is a disk set flush in a concrete monument by a gravel parking
lot, 75.86 m (248.9 ft) SSE of bench mark 6918 E 1982, 14.81 m (48.6 ft) north
of the NE corner of the chapel, 10.42 m (34.2 ft) WSW of the centerline of the
road, 6.04 m (19.8 ft) SE of the SE corner of the gravel parking lot, 1.58 m
(5.2 ft) SSE of a power pole with a witness sign and a junction box, and at
ground level.
BENCH MARK STAMPING: 6918 E 1982
DESIGNATION: 866 6918 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 6666
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2604
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 37.8' N ( 32.63000) LONGITUDE: 80° 10.0' W ( -80.16670)
The bench mark is a disk set flush in a concrete monument located NW of a gravel
parking lot, 63.43 m (208.1 ft) NNE of the centerline of the sand drive leading
to the head resident of the camp, 9.66 m (31.7 ft) NNE of the centerline of the
road, 6.92 m (22.7 ft) SE of a guy wire anchor, 0.70 m (2.3 ft) south of a power
pole with a witness sign, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8666918 PUBLICATION DATE: 05/23/2003
Name: HO-NO-WAH SCOUT CAMP, BOHICKET CR
SC
NOAA Chart: 11522 Latitude: 32° 37.5' N ( 32.62500)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.0' W ( -80.16670)
T I D A L D A T U M S
Tidal datums at HO-NO-WAH SCOUT CAMP, BOHICKET CR based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: October 1982 - December 1982
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8665530 CHARLESTON, COOPER RIVER ENTRANCE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.979
MEAN HIGH WATER MHW = 1.870
North American Vertical Datum NAVD88 = 1.123
MEAN SEA LEVEL MSL = 1.069
MEAN TIDE LEVEL MTL = 0.967
MEAN LOW WATER MLW = 0.064
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6918 A 1982 3.873 2.003
6918 B 1982 3.720 1.850
6918 C 1982 4.122 2.252
6918 D 1982 4.084 2.214
6918 E 1982 4.693 2.823
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8666918 PUBLICATION DATE: 05/23/2003
Name: HO-NO-WAH SCOUT CAMP, BOHICKET CR
SC
NOAA Chart: 11522 Latitude: 32° 37.5' N ( 32.62500)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.0' W ( -80.16670)
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.