GLOUCESTER POINT AA: VIMS Watermans Hall lower level, Gloucester Point, VA (Absolute)
GREAT FALLS PARK AA: Preservation Rm. Visitor Cent., Great Falls Nat'l. Park, VA (Absolute)
GREAT FALLS PARK AB: Office for Visitor Center, Great Falls Nat'l. Park, VA (Absolute)
HERNDON AA: Defense Mapping Agency, Bldg, P000001, Great Falls, VA (Absolute)
HERNDON CA: Defense Mapping Agency, Great Falls, VA (Abs. Excenter\Calibration)
WASHINGTON L: Washington National Airport, Arlington, VA (Natl. Net\Calibration)
WASHINGTON R: J.F. Dulles Int'l Airport Terminal, Herndon, VA (Calibration)
Contact NOAA/NGS for information on the Blue Ridge Calibration Line,
a 320 mGal range between WASHINGTON R and SKYLAND B RESET.
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