Open-File Report 00-032
The 1998 Glacier Bay survey was navigated with a Leica Differential Global Positioning System (DGPS) which provided a ship position with accuracy of 1-5 m in DGPS mode. At times during the cruise, differential signal was interrupted. In non-differential mode, the receiver provided a position with 30-50 m accuracy. A KVH Industries Inc. azimuth digital gyro-compass provided ship headings with 0.5 degree accuracy. Navigation data were recorded using Yo-Nav version 1.19 (Gann, 1992). The sidescan fish is towed approximately 20 m above the seafloor. The distance behind the ship of the fish was not known during this survey and must be estimated when the data is processed in order to produce the sidescan image mosaics.
For more information, contact the PCMSC team.
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U.S. Department of the Interior
U.S. Geological Survey