GPS Marker at WMHS
A Global Positioning System (GPS) marker has been placed and surveyed on the small hill overlooking the southeast corner of the football field.
The marker – often called a “GPS Monument” – is for the use of students to test the accuracy of GPS receivers used in class, their personal GPS receivers, or GPS data which may be available from cell phones.
The marker is a brass disk about 5 inches in diameter at, ground level, with the words “MCPS Marker #1.”
A survey by The Institute of Navigation (ION) has determined that the mark at the center of the disk is located at the following coordinates in the World Geodetic System WGS-84:
Latitude
39 deg 11 min 3.00437 s of arc
39.184167881 deg of arc
West longitude
77 deg 12 min 45.65524 sec of arc
77.212682011 deg of arc
Height above the geoid 102.191 meters
ION used the Online Positioning User Service (OPUS) for these computations. The results are accurate to about [-6,6] cm in easting, [-5,5] cm in northing and [-20,20] cm in height.
The marker looks like this: MCPS Marker bitmap
The marker can be located by walking eastward along a line extended from the northern boundary of the wooden shed which is located to the east of the field house.
