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: Present methods for determining sound speed corrections for echo soundings in continental shelf areas are time-consuming and expensive. This study was undertaken to determine whether or not sound speed correctors of sufficient accuracy could be deduced from historical data. Historical sound speed data for an east coast, shelf area indicates that temporal ans spatial variability exceeds acceptable limits for sounding corrections, thus precluding the use of historical data only for corrector determination. Examination of temperatures and salinity data indicates that historical salinity values in the region are sufficiently stable to allow acceptable sound speed corrections to be made derived on the basis of in-situ temperature measurement and historically derived salinity values. Expendable bathythermograph probes are capable of meeting temperature requirements. The constancy of the T-S relation in such regions may allow salinity determination from water temperatures alone. (Author)

Coastal controls on vertical sound speed determination and corrections to echo soundings