Navigation Systems

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.

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For more information, contact the PCMSC team.

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Use of trade, product, or firm names in this report is for descriptive purposes only and does not imply endorsement by the U.S. Government. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Suggested citation:
Cochrane, Guy R., Carlson, Paul R., Boyle, Michael E., Gabel, Gregory L., and Hooge, Philip N., 2000, Physical Characteristics of Dungeness Crab and Halibut Habitats in Whidbey Passage, Alaska: U.S. Geological Survey Open-File Report 00-032, https://pubs.usgs.gov/of/2000/0032/.

U.S. Department of the Interior
SALLY JEWELL, Secretary

U.S. Geological Survey
Suzette M. Kimball, Acting Director