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Datums Page Page 1 of 5
Station ID: 8414888 PUBLICATION DATE: 05/21/2004
Name: PULPIT HARBOR, PENOBSCOT BAY
ME
NOAA Chart: 13302 Latitude: 44° 9.4' N ( 44.15670)
USGS Quad: VINALHAVEN Longitude: 68° 53.2' W ( -68.88670)
To reach the tidal bench marks by boat, travel to the northern shore of North
Haven Island to Pulpit Harbor. Proceed into Pulpit Harbor to the small inlet on
the north shore of Pulpit Harbor. The bench marks are located on the east shore
of the small inlet 0.5 km (0.3 mi) ESE of Pulpit Rock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 5 1944
DESIGNATION: 841 4888 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 1862
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 44° 9.4' N ( 44.15670) LONGITUDE: 68° 53.2' W ( -68.88670)
The primary bench mark is a disk set on the higher and northerly one of two
fairly prominent rock outcrops in the field, 6.1 m (20 ft) west of a narrow dirt
road leading north from the gage site toward a house on the hill.
BENCH MARK STAMPING: NO 6 1944
DESIGNATION: 841 4888 TIDAL 6
MONUMENTATION: Tidal Station disk VM#: 1863
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock ledge OPUS PID:
LATITUDE: 44° 9.4' N ( 44.15670) LONGITUDE: 68° 53.2' W ( -68.88670)
The bench mark is a disk set in a crevice in an only rock ledge outcrop on the
western entrance point of the most westerly small inlet on the north shore of
Pulpit Harbor, 60 m (200 ft) SW of bench mark NO 5 1944, 12 m (40 ft) north of
the shoreline.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8414888 PUBLICATION DATE: 05/21/2004
Name: PULPIT HARBOR, PENOBSCOT BAY
ME
NOAA Chart: 13302 Latitude: 44° 9.4' N ( 44.15670)
USGS Quad: VINALHAVEN Longitude: 68° 53.2' W ( -68.88670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 7 1944
DESIGNATION: 841 4888 TIDAL 7
MONUMENTATION: Tidal Station disk VM#: 1864
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock ledge OPUS PID:
LATITUDE: 44° 9.4' N ( 44.15670) LONGITUDE: 68° 53.2' W ( -68.88670)
The bench mark is a disk set in a rock ledge outcrop on the east shore of the
most westerly small inlet on the north shore of Pulpit Harbor, 49 m (160 ft)
south of the east end of the small bridge on the second ledge south of the
bridge.
BENCH MARK STAMPING: NO 8 1946
DESIGNATION: 841 4888 TIDAL 8
MONUMENTATION: Tidal Station disk VM#: 1865
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 44° 9.4' N ( 44.15670) LONGITUDE: 68° 53.2' W ( -68.88670)
The bench mark is a disk set in a rock ledge outcrop, 12 m (40 ft) SE of bench
mark NO 6 1944, 1 m (3 ft) above the shore line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8414888 PUBLICATION DATE: 05/21/2004
Name: PULPIT HARBOR, PENOBSCOT BAY
ME
NOAA Chart: 13302 Latitude: 44° 9.4' N ( 44.15670)
USGS Quad: VINALHAVEN Longitude: 68° 53.2' W ( -68.88670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4888 E 1983
DESIGNATION: 841 4888 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 1866
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 44° 9.4' N ( 44.15670) LONGITUDE: 68° 53.2' W ( -68.88670)
The bench mark is a disk set in a rock outcrop, 55.7 m (182.8 ft) NE of bench
mark NO 6 1944, 31.5 m (103.2 ft) west of bench mark NO 5 1944, and 19.4 m (63.8
ft) east of the east side of a red barn.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8414888 PUBLICATION DATE: 05/21/2004
Name: PULPIT HARBOR, PENOBSCOT BAY
ME
NOAA Chart: 13302 Latitude: 44° 9.4' N ( 44.15670)
USGS Quad: VINALHAVEN Longitude: 68° 53.2' W ( -68.88670)
T I D A L D A T U M S
Tidal datums at PULPIT HARBOR, PENOBSCOT BAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: July 1983 - August 1983
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8418150 PORTLAND, CASCO BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 3.245
MEAN HIGH WATER MHW = 3.114
MEAN SEA LEVEL MSL = 1.636
MEAN TIDE LEVEL MTL = 1.614
MEAN LOW WATER MLW = 0.113
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 5 1944 9.730 6.616
NO 6 1944 7.050 3.936
NO 7 1944 3.990 0.876
NO 8 1946 4.182 1.068
4888 E 1983 10.025 6.911
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8414888 PUBLICATION DATE: 05/21/2004
Name: PULPIT HARBOR, PENOBSCOT BAY
ME
NOAA Chart: 13302 Latitude: 44° 9.4' N ( 44.15670)
USGS Quad: VINALHAVEN Longitude: 68° 53.2' W ( -68.88670)
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.