The directory rawnav contains the Raw DGPS Navigation
that was collected using a USGS differential GPS system (Ashtech). These files
were extracted from the SEG-Y seismic trace headers for each unique fix available
(~ every 5 sec.). WARNING: These data have
not been checked for errors. Use with caution.
The seismic shot navigation is received by the differential GPS system (DGPS),
sent directly to the ISIS acquisition system, and recorded in the SEG-Y header
of each file. The navigation is later extracted from the header with the shot
numbers in a corresponding field. These navigation data have been checked for
errors, and are assumed to be correct.
The navigation is stored in ASCII files using eight fields separated by commas.
These files are located in the shotnav