U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


To reach the station from the Post Office in Hatteras Village proceed 2.092 km
(1.3 miles) south on Hwy 12 to Coast Guard road and turn right on Coast Guard
road and proceed to the gate. Pass through the gate, turn to the right and drive
to docks. The station is located in the NW corner of the small boat dock. The
bench marks are along the open area near the water.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  4467 C 2010
                         DESIGNATION:          865 4467 C

MONUMENTATION:           Flange-encased Rod                    VM#:        19621
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID#: BBFF30
LATITUDE:   35° 12.3' N (  35.20500)          LONGITUDE:  75° 42.2' W ( -75.70330)


The primary bench mark is a stainless steel deep rod driven 35.1 m (115.2 ft) to
refusal with a NOS logo cap and concrete kick block, northwest corner of a
helicopter pad, 30.4 m (99.7 ft) south of the south edge of a rock jetty, 24.96
m (81.9 ft) north-northwest of the southeast corner of the helicopter pad, and
1.82 m (6.0 ft) west of the northwest corner of the helicopter pad.  *Note -
this mark does not meet the specifications of a class 'A' rod mark.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  CAHA 23 2010
                         DESIGNATION:          CAHA 23

MONUMENTATION:           Metal Rod                             VM#:        19623
AGENCY:                  NOS                                   IDB PID#:  DN6302
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   35° 12.4' N (  35.20714)          LONGITUDE:  75° 42.3' W ( -75.70469)


The bench mark is a deep-driven rod with a 13 cm (5 inch) NOS logo cap, 23.42 m
(76.8 ft) east of a red fire hydrant, 21.90 m (71.9 ft) northwest of the center
of a concrete pump station, and 6.98 m (22.9 ft) north-northeast of the center
of a paved road leading to the USGS base.



                         BENCH MARK STAMPING:  4467 B 2010
                         DESIGNATION:          865 4467 B

MONUMENTATION:           Tidal Station disk                    VM#:        19624
AGENCY:                  NOS                                   IDB PID:         
SETTING CLASSIFICATION:  Concrete ledge                        OPUS PID:        
LATITUDE:   35° 12.5' N (  35.20831)          LONGITUDE:  75° 42.2' W ( -75.70392)


The bench mark is a disk set flush in the concrete cap on the south corner of
the dock, 33.38 m (109.5 ft) southwest of the offshore end of the dock, 29.13 m
(95.6 ft) north-northeast of the northeast corner of a block garage, and 22.70 m
(74.5 ft) southeast of a metal light pole.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  4467 A 2010
                         DESIGNATION:          865 4467 A

MONUMENTATION:           Tidal Station disk                    VM#:        19625
AGENCY:                  NOS                                   IDB PID:         
SETTING CLASSIFICATION:  Concrete ledge                        OPUS PID:        
LATITUDE:   35° 12.5' N (  35.20864)          LONGITUDE:  75° 42.2' W ( -75.70417)


The bench mark is a NOS disk set flush in the concrete cap at the northwest
corner of the bulkhead near the NOAA tide station, 32.30 m (106.0 ft) southwest
of the northeast outside corner of the dock, 22.20 m (72.8 ft) east of a gazebo,
18.05 m (59.2 ft) north-northwest of a metal light pole, and 12.85 m (42.2 ft)
northeast of the northeast corner of a stone fuel pump building.



                         BENCH MARK STAMPING:  4467 D 2015
                         DESIGNATION:          865 4467 D

MONUMENTATION:           Tidal Station disk                    VM#:        21469
AGENCY:                  NOS                                   IDB PID:         
SETTING CLASSIFICATION:  Concrete Pad                          OPUS PID:        
LATITUDE:   35° 12.4' N (  35.20583)          LONGITUDE:  75° 42.3' W ( -75.70483)


The bench mark is located on the graveyard of the Atlantic Museum property,
38.40 m (126.0 ft) south of the Hotel De Afrique monument, 14.3 m (46.9 ft)
south-southeast of the east facing corner of the USS monitor monument, 2.9 m
(9.5 ft) northeast of the edge of the parking lot curb, and 0.7 m (2.3 ft) east
of the center of the nautical flag pole.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  NC12 11 2000
                         DESIGNATION:          NC 12 11

MONUMENTATION:           Horizontal Station disk               VM#:        21470
AGENCY:                  North Carolina Geodetic Survey        IDB PID#:  DK3459
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   35° 12.4' N (  35.20611)          LONGITUDE:  75° 42.2' W ( -75.70306)


The bench mark is located 19.1 m (62.5 ft) northwest of a NPS monument--P.I. 
2877+75--, 17.4 m (57.1 ft) west-southwest of a power pole with transformer and
a reference tag, 13.5 m (44.4 ft) south of the centerline of NC 12, 5.4 m (17.8
ft) southwest of the base of the westernmost of 3 guy wires, 0.4 m (1.3 ft)
north-northeast of a carsonite witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  NC12 12 2000
                         DESIGNATION:          NC 12 12

MONUMENTATION:           Horizontal Station disk               VM#:        21471
AGENCY:                  North Carolina Geodetic Survey        IDB PID#:  DK3460
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   35° 12.5' N (  35.20861)          LONGITUDE:  75° 41.9' W ( -75.69917)


The bench mark is located 19.1 m (62.5 ft) northwest of NPS monument--p.i. 
2877+75--, 17.4 m (57.1 ft) west-southwest of a power pole with transformer and
a reference tag, 13.5 m (44.4 ft) south of the centerline of NC 12 11, 5.4 m
(17.8 ft) southwest of the base of the westernmost of 3 guy wires, and 0.4 m
(1.3 ft) north-northeast of a carsonite witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  Y 194 1977
                         DESIGNATION:          Y 194

MONUMENTATION:           Vertical Control disk                 VM#:        21472
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  EX0261
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   35° 12.8' N (  35.21294)          LONGITUDE:  75° 41.7' W ( -75.69563)


The bench mark is located 35.4 m (116.1 ft) west of the center of the campground
driveway, 28.28 m (92.78 ft) north of the northeast corner of a frame house, and
29.26 m (96.00 ft) west of a telephone pedestal (16W), and is .076 m (3 in)
below ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  A 193 1977
                         DESIGNATION:          A 193

MONUMENTATION:           Vertical Control disk                 VM#:        22928
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  EX0260
SETTING CLASSIFICATION:  Base plate screwed into ground        OPUS PID:        
LATITUDE:   35° 13.0' N (  35.21664)          LONGITUDE:  75° 41.2' W ( -75.68669)


The bench mark is a bench mark disk located 30.2 m (99.1 ft) west of the
westmost corner of a telephone building, 16.2 m (53.1 ft) NW of the center of a
dirt driveway, 13.4 m (44.0 ft) NE of the centerline of NC 12, 6.6 m (21.7 ft)
WNW of a fence post with reference tags, and 3.9 m (12.8 ft) north of a power
pole with reference tags.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                            T I D A L   D A T U M S 


Tidal datums at USCG STATION HATTERAS, PAMLICO SOUND based on:

     LENGTH OF SERIES:      5 YEARS
     TIME PERIOD:           05/2010-04/2011, 09/2013-08/2017
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8652587 OREGON INLET MARINA, PAMLICO SOUND


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     HIGHEST OBSERVED WATER LEVEL (10/09/2016)         =  1.925
     MEAN HIGHER HIGH WATER                     MHHW   =  0.198
     MEAN HIGH WATER                            MHW    =  0.166
     North American Vertical Datum              NAVD88 =  0.119
     MEAN SEA LEVEL                             MSL    =  0.097
     MEAN TIDE LEVEL                            MTL    =  0.095
     MEAN LOW WATER                             MLW    =  0.023
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (08/27/2011)         = -0.821

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     4467 C 2010                                 1.627    1.461
     CAHA 23 2010                                1.152    0.986
     4467 B 2010                                 2.153    1.987
     4467 A 2010                                 2.160    1.994
     4467 D 2015                                 1.901    1.735
     NC12 11 2000                                3.377    3.211
     NC12 12 2000                                2.164    1.998
     Y 194 1977                                  0.672    0.506
     A 193 1977                                  0.992    0.825


Foot Notes:

Bench mark A 193 1977 is based on one differential leveling connection and do
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for these marks. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  9 of  9

                                                                                
Station ID: 8654467                         PUBLICATION DATE:  10/07/2020
Name:       USCG STATION HATTERAS, PAMLICO SOUND              
            NC
NOAA Chart: 11555                           Latitude:   35° 12.5' N (  35.20864)
USGS Quad:  HATTERAS                        Longitude:  75° 42.2' W ( -75.70417)


                             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.