The GPS antennas are mounted on the roof near the instrument. This allows optimum reception of the GPS signal for accurate timing and location.
U.S. Department of the Interior | U.S. Geological Survey URL: <http://pubs.usgs.gov/of/2001/ofr-01-0344/GPSantenna.html> Questions or Assistance: GS Pubs Web Contact Page Last Modified: Tue Aug 2 11:59 EDT 2005
