NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Bench Mark Sheet for 2431000, Diego Garcia United Kingdom

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 2431000                         PUBLICATION DATE:  07/12/2016
Name:       DIEGO GARCIA, INDIAN OCEAN.                       
NOAA Chart:                                 Latitude:    7° 17.4' S (  -7.29000)
USGS Quad:                                  Longitude:  72° 23.6' E (  72.39330)


To reach the tidal bench marks from the MAC parking lot, turn left and head up
the small hill.  At the stop sign, turn left; go 0.5 km (0.3 mi) until you come
to a blue sign on the left hand side of the road.  The sign will say "Wharf A
Wharf B Small Boast Basin MSCU Bldg 469."  Turn right, head down the road for
0.5 km (0.3 mi), turn left after you pass through the gate; go past the MSCU
building onto the dirt road.  The tide station is inside a cinder block
buildings #460.  NODC has the key.


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


                 PRIMARY BENCH MARK STAMPING:  1000 D 1990
                         DESIGNATION:          243 1000 D

MONUMENTATION:           Survey disk                           VM#:        12396
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The primary bench mark is a disk set in a concrete pad supporting ten electrical
switch panels, 79 m (260 ft) west of bench mark 1000 C 1990, 55 m (180 ft) SW of
wharf face, 1.83 m (6.0 ft) NE of northern-most switch box, and 0.15 m (0.5 ft)
south of the north corner.



                         BENCH MARK STAMPING:  1000 A 1990
                         DESIGNATION:          243 1000 A

MONUMENTATION:           Survey disk                           VM#:        12393
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.26917)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in concrete near the NE face of the deep draft
wharf, 17 m (55 ft) NE of  Building #460 and 0.40 m (1.30 ft) SW of the
northern-most bollard on wharf.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 2431000                         PUBLICATION DATE:  07/12/2016
Name:       DIEGO GARCIA, INDIAN OCEAN.                       
NOAA Chart:                                 Latitude:    7° 17.4' S (  -7.29000)
USGS Quad:                                  Longitude:  72° 23.6' E (  72.39330)


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


                         BENCH MARK STAMPING:  1000 B 1990
                         DESIGNATION:          243 1000 B

MONUMENTATION:           Survey disk                           VM#:        12394
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in concrete near the NE face of the deep draft
wharf, located near two bollards which are set between numbers 375 and 425 on
bullrail, 120 m (393 ft) SE of bench mark A and 0.46 m (1.5 ft) SW of bollards.



                         BENCH MARK STAMPING:  1000 C 1990
                         DESIGNATION:          243 1000 C

MONUMENTATION:           Survey disk                           VM#:        12395
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in concrete near the NE face of the deep draft
wharf, near to two bollards which are placed between numbers 725 and 800 on
bullrail, 119 m (390 ft) SE of bench mark B, and 0.46 m (1.5 ft) SW of bollards.



                         BENCH MARK STAMPING:  1000 E 1990
                         DESIGNATION:          243 1000 E

MONUMENTATION:           Survey disk                           VM#:        12397
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in concrete on the SE end of finger pier #4025 in
the small boat harbor, 1.68 m (5.50 ft) NW of SE end of pier, and 0.15 m (0.5
ft) NE of the SE edge of pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 2431000                         PUBLICATION DATE:  07/12/2016
Name:       DIEGO GARCIA, INDIAN OCEAN.                       
NOAA Chart:                                 Latitude:    7° 17.4' S (  -7.29000)
USGS Quad:                                  Longitude:  72° 23.6' E (  72.39330)


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


                         BENCH MARK STAMPING:  1000 F 1990
                         DESIGNATION:          243 1000 F

MONUMENTATION:           Survey disk                           VM#:        12398
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in the SE end of a concrete seawall at the SW end
of the small boat harbor, 12 m (39 ft) NW of the center of the NW entrance to
wharf, and 1.22 m (4.0 ft) NW of the SE end of seawall.



                         BENCH MARK STAMPING:  1000 G 1990
                         DESIGNATION:          243 1000 G

MONUMENTATION:           Survey disk                           VM#:        12399
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in a concrete sea wall at the SW end of small boat
harbor, located between numbers 325 and 350 on seawall, 195 ft north of north
end of Building #4005, and 110 m (360 ft) NW of bench mark 1000 F 1990.



                         BENCH MARK STAMPING:  1000 H 1991
                         DESIGNATION:          243 1000 H

MONUMENTATION:           Survey disk                           VM#:        12400
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in the SE end of Finger Pier #4027 in the small
boat harbor, 1.13 m (3.7 ft) NW of the SE end of the pier and 0.24 m (0.8 ft) NE
of the SW edge of the pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 2431000                         PUBLICATION DATE:  07/12/2016
Name:       DIEGO GARCIA, INDIAN OCEAN.                       
NOAA Chart:                                 Latitude:    7° 17.4' S (  -7.29000)
USGS Quad:                                  Longitude:  72° 23.6' E (  72.39330)


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


                         BENCH MARK STAMPING:  1000 J 1991
                         DESIGNATION:          243 1000 J

MONUMENTATION:           Survey disk                           VM#:        12401
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in the concrete entrance of the west roll up door
of the warehouse on the deep draft wharf, about 76 m (250 ft) SW of bench mark
1000 C 1990, 2.87 m (9.4 ft) NE of the door entering Building 461, 0.52 m (1.7
ft) east of a 1.22 m (4.0 ft) high black and yellow striped post, and 0.12 m
(0.4 ft) NE of the SW edge of a roll-up door.



                         BENCH MARK STAMPING:  DDW1 EL 10
                         DESIGNATION:          243 1000 DDW1 EL 10

MONUMENTATION:           Survey disk                           VM#:        12402
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Set in concrete                       OPUS PID:        
LATITUDE:    7° 16.2' S (  -7.27000)          LONGITUDE:  72° 23.8' E (  72.39670)


The bench mark is a disk set in concrete near the NE face of the deep draft
wharf, 14.54 m (47.7 ft) SW of the SW corner of Building #460, 8.20 m (26.9 ft)
SE of a 12-inch diameter red fire main and 6.61 m (21.7 ft) NE of the center of
a 0.76 m (2.5 ft) diameter access cover stamped "electric."

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 2431000                         PUBLICATION DATE:  07/12/2016
Name:       DIEGO GARCIA, INDIAN OCEAN.                       
NOAA Chart:                                 Latitude:    7° 17.4' S (  -7.29000)
USGS Quad:                                  Longitude:  72° 23.6' E (  72.39330)


                            T I D A L   D A T U M S 


Tidal datums at DIEGO GARCIA, INDIAN OCEAN. based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           January 1993 - December 1993
     TIDAL EPOCH:           NONE
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (02/19/1992)         =  1.889
     MEAN HIGHER HIGH WATER                     MHHW   =  1.186
     MEAN HIGH WATER                            MHW    =  1.157
     MEAN TIDE LEVEL                            MTL    =  0.602
     MEAN SEA LEVEL                             MSL    =  0.602
     MEAN LOW WATER                             MLW    =  0.047
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (11/23/1995)         = -0.440



Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1000 D 1990                                 4.205    3.048
     1000 A 1990                                 4.039    2.882
     1000 B 1990                                 3.998    2.841
     1000 C 1990                                 4.114    2.957
     1000 E 1990                                 2.574    1.417
     1000 F 1990                                 2.840    1.683
     1000 G 1990                                 3.486    2.329
     1000 H 1991                                 2.575    1.418
     1000 J 1991                                 4.165    3.008
     DDW1 EL 10                                  3.894    2.737


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

                                                                                
Station ID: 2431000                         PUBLICATION DATE:  07/12/2016
Name:       DIEGO GARCIA, INDIAN OCEAN.                       
NOAA Chart:                                 Latitude:    7° 17.4' S (  -7.29000)
USGS Quad:                                  Longitude:  72° 23.6' E (  72.39330)


                             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 any other fixed island datum.

This tide station location has a local island datum.  Island datums
are specific fixed geodetic datums whose elevation relationship 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/.

Return to Top
Products available at 2431000 Diego Garcia, United Kingdom

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services