dbname:             ../adcpdb/aship
   output:             ./contour
   step_size:          1        /* must be 1 for navigation */
   ndepth:             128
   time_ranges:        separate        
   year_base=          2005

   option_list:
       pg_min=                50
       reference:             final_ship_ref

       regrid:         average
                       depth

                       grid number=    40
                       origin=         30
                       increment=      10

                         
     flag_mask:        ALL_BITS
       end
     end
@aship.tmg             /* explicit time ranges or of the form "@gridfile" */