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Details for Benchmark: HV6702

N 38° 19.996 W 076° 27.431 (NAD 83)

Altitude: 7

Coordinates may not be exact. Altitude is SCALED and location is ADJUSTED. (more info)

Location:
In CALVERT county, MD View Original Datasheet
Designation:
GYRO 1944
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Found this control while bicycling around the old naval amphibious warfare training center. Mark is in good condition with the survey marker still in place as well.

[Photos:]
photoLooking N toward mark
photoMark 0.3 M N of survey stake
photoThe mark
"GYRO"

Documented History (by the NGS)

01/01/1944 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1944 (TBR) STATION IS ON THE NAVAL AMPHIBIOUS TRAINING BASE ON THE NE BANK OF BACK CREEK, ABOUT 1 MILE N OF THE TOWN OF SOLOMONS, S OF THE MACHINE SHOP FOR THE BASE WHICH IS THE E OF TWO LONG BUILDINGS, 27.48 METERS SE OF THE SW CORNER, AND 28.69 METERS SW OF THE SE CORNER OF THE MACHINE SHOP. THIS BUILDING IS ALSO USED FOR GYRO TESTING. STATION MARK IS A BRONZE HYDROGRAPHIC-STATION DISK SET IN THE TOP OF A CONCRETE POST. IT IS FLUSH WITH THE GROUND AND PROTECTED BY A PIPE FRAMEWORK.
01/01/1960 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (LFB) STATION RECOVERED IN GOOD CONDITION. A NEW DESCRIPTION FOLLOWS--STATION IS LOCATED ON THE NE BANK OF BACK CREEK, ABOUT 1 MILE N OF THE TOWN OF SOLOMONS ON PROPERTY OF CALVERT MARINA AND YACHT CLUB. ON THE SOUTH SIDE OF THE MOST EASTERLY OF TWO LARGE BUILDINGS USED FOR BOAT STORAGE, 90.1 FT. SE OF THE SW CORNER, 94.0 FT. SW OF THE SE CORNER AND 2 FT. NW OF A SMALL ASH TREE. STATION IS MARKED BY A HYDROGRAPHIC-STATION DISK STAMPED GYRO 1944 SET IN TOP OF A CONCRETE POST PROJECTING 6 INCHES.
01/01/1976 by MDDNR (GOOD)
RECOVERY NOTE BY MD DEPT OF NAT RES 1976 (GEH) GYRO 1944 GOOD RECOVERED AS DESCRIBED WITH ADD STA. IS ON SMALL RISE IN THE GROUND ABOUT 2 FEET SOUTHWESTERLY OF A 3 TRUNKED LOCUST TREE
01/01/1987 by NOS (GOOD)
RECOVERY NOTE BY NATIONAL OCEAN SERVICE 1987 (MWJ) THE STATION WAS RECOVERED AT THIS DATE. RMS NOT RECOVERED AT THIS TIME
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (WSB) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in January 1992.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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