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97FGS01 Navigation Errors

Note: Serious problems were noticed with the GPS data for 97FGS01 during processing, and many of these errors could not be edited from the navigation files. Several lines are missing navigation at the start of line, end of line, or within the line, and spurious data points remain. Use these data with caution. On the trackline maps, the location of missing navigation data within a line is inferred by linear interpolation of the first and last known data points. A dashed yellow line indicates a navigation gap of 1.5 minutes or more. A cross marks the location of the first available navigation fix for lines missing navigation for the first 100 shots or more at the start of line. Asterisks mark the locations of spurious navigation fixes or missing navigation at the end of a line.