Go to the list of seismic processes.      Go to SIOSEIS introduction.

    Analysis of the "realtime nav block" versus "TS files".  In this analysis, the
nav block came from the LDEO section of the SEG-D external header from three
different tapes.  The lat/long in the nav block comes from the Spectra system,
which controls the firing, and is referenced to "ref" on the ship diagram (the 
Tasman is a feed to the POS/MV, which feeds Spectra, which generates UKOAA
P1/90 files, which are post processed by Sprint).
    TS files are post processed using "GP01" logged data where GP01 is the Tasman
receiver (Trimble Tasman Y-code).
    The diagram shows the ship reference point 33.3m forward of the Tasman antenna.
    
-------------    3490 tape 500
rt 004770 2002+201:20:58:28.283 2002+201:20:58:29.833 N 46 58.9989 W 129 37.4935 2783.2
ts        2002+201:20:58:28.283 004770                N 46 58.9916 W 129 37.4664 BOL34
  The distance between the two points is  36.9288042 meters.
gp01: 2002+201:20:58:28.827 $GPGGA,205827.876,4658.9903,N,12937.4661,W,3,06,1.3,004.9,M,022.3,M,,*72
  
rt 004771 2002+201:20:58:43.010 2002+201:20:58:44.576 N 46 59.0061 W 129 37.5212 2785.2
ts        2002+201:20:58:43.010 004771                N 46 58.9990 W 129 37.4942 BOL34
  The distance between the two points is  36.6762321 meters.
gp01: 2002+201:20:58:41.825 $GPGGA,205840.876,4658.9966,N,12937.4908,W,3,06,1.3,006.6,M,022.3,M,,*7D
gp01: 2002+201:20:58:43.825 $GPGGA,205842.876,4658.9980,N,12937.4945,W,3,06,1.3,006.3,M,022.3,M,,*7B

rt 004772 2002+201:20:58:57.594 2002+201:20:58:59.119 N 46 59.0137 W 129 37.5483 2783.2
ts        2002+201:20:58:57.594 004772                N 46 59.0064 W 129 37.5217 BOL34
  The distance between the two points is  36.3394616 meters.
gp01: 2002+201:20:58:57.828 $GPGGA,205856.876,4659.0058,N,12937.5205,W,3,06,1.3,007.6,M,022.3,M,,*70
  
-------------    3490 tape 784
rt 000437 2002+208:05:01:10.017 2002+208:05:01:11.863 N 46 00.1113 W 130 02.1600 1598.3
ts        2002+208:05:01:10.017 000437                N 46 00.1279 W 130 02.1772 BOL51
  The distance between the two points is  37.9309477 meters.
gp01: 2002+208:05:01:09.894 $GPGGA,050108.734,4600.1295,N,13002.1783,W,3,06,1.5,007.7,M,024.3,M,,*77
  
rt 000438 2002+208:05:01:25.884 2002+208:05:01:27.706 N 46 00.0929 W 130 02.1477 1599.3
ts        2002+208:05:01:25.884 000438                N 46 00.1092 W 130 02.1649 BOL51
  The distance between the two points is  37.481861 meters.
  The distance between rt shots is  37.6037181 meters.
  The distance between ts shots is  38.1081825 meters
gp01: 2002+208:05:01:23.897 $GPGGA,050122.734,4600.1131,N,13002.1667,W,3,06,1.5,007.3,M,024.3,M,,*7D
  
rt 000439 2002+208:05:01:41.465 2002+208:05:01:43.429 N 46 00.0748 W 130 02.1355 1590.3
ts        2002+208:05:01:41.465 000439                N 46 00.0907 W 130 02.1527 BOL51
  The distance between the two points is  36.8875739 meters.
  The distance between rt shots is  37.3813659 meters.
  The distance between ts shots is  37.7176345 meters.
gp01: 2002+208:05:01:40.901 $GPGGA,050139.734,4600.0930,N,13002.1542,W,3,06,1.5,006.6,M,024.3,M,,*7F
 
-------------    3490 tape 900
rt 000569 2002+211:12:14:56.415 2002+211:12:14:58.158 N 45 24.2278 W 130 04.7754 2277.3
ts        2002+211:12:14:56.415 000569                N 45 24.2189 W 130 04.7490 BOL68
  The distance between the two points is  38.1896179 meters
gp01: 2002+211:12:14:56.140 $GPGGA,121455.183,4524.2181,N,13004.7474,W,3,06,1.8,014.2,M,025.6,M,,*72
  
rt 000570 2002+211:12:15:12.076 2002+211:12:15:13.601 N 45 24.2358 W 130 04.8017 2291.3
ts        2002+211:12:15:12.076 000570                N 45 24.2270 W 130 04.7745 BOL68
  The distance between the two points is  39.0560737 meters.
  The distance between rt shots is  37.380299 meters.
  The distance between ts shots is  36.5001295 meters
gp01: 2002+211:12:15:13.143 $GPGGA,121512.183,4524.2273,N,13004.7753,W,3,06,1.8,012.9,M,025.6,M,,*75

rt 000571 2002+211:12:15:28.203 2002+211:12:15:29.724 N 45 24.2438 W 130 04.8289 2300.3
ts        2002+211:12:15:28.203 000571                N 45 24.2355 W 130 04.8008 BOL68
  The distance between the two points is  39.7589519 meters.
  The distance between rt shots is  38.4611842 meters.
  The distance between ts shots is  37.7570393 meters.
gp01: 2002+211:12:15:28.146 $GPGGA,121527.183,4524.2358,N,13004.7998,W,3,06,1.8,010.8,M,025.6,M,,*71

Go to the list of seismic processes.      Go to SIOSEIS introduction.