Global Positioning System
For many of these monuments, the latitude and longitude are given here as a way of
specifying the geographic position accurately, in a format easy for anyone to use.
When your hand-held GPS unit reports readings that match those given here, you
will be within fifty paces of the monument or tombstone or other historic marker.
These GPS positions can also be used to pinpoint a location on a map, for example
to use a highway map to find how to reach one of these sites. For plaques located in
a building, the GPS position given here is that of the main entrance to the building.