CALCM data format

Processed magnetic data that includes magnetic anomaly, date, Greenwich Mean Time (GMT), and latitude and longitude recorded as decimal degrees. South latitude and west longitude are recorded as negative values.

     COLS      FIELD NAME                            FORMAT
     ----      ---------------------------           ------
     1-2       ship                                   A2
     3-5       cruise number                          I3
     6-8       time zone                              I3
     10-13     year                                   I4
     15-16     day                                    I2
     17-18     month                                  I2
     20-25     time of day (GMT as HHMM.T)            F6.1
     20-21     hour                                   I2
     22-25     minute and tenths of minute            F4.1
     26-32     latitude (decimal degrees)             F7.4
     33-40     longitude (decimal degrees)            F7.4
     42-47     observed magnetic value (gammas)       F6.0
     48-53     regional magnetic value (gammas)       F6.0
     54-58     magnetic anomaly (gammas)              I5
     59-61     altitude                               F3.1
     62-68     distance along track (kilometers)      F7.2
     70-72     ship's heading (degrees)               I3
     73-76     ship's speed (knots)                   I4
     77-83     2nd observed magnetic
               value (gammas)                         F6.0
     84-91     separation distance (meters)           F6.2
     92-106    gradient (gammas/km)                   E15.7

CALCM example:

                                                                                                    1     1
          1         2         3         4         5         6         7         8         9         0     0
 1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456
 ----------------------------------------------------------------------------------------------------------
 FA 17  0   76 22 6 1916.7 321946 -795750 52465.52994. -529 .0  757 5  51  6152471.    .00     .0000000E+00
 FA 17  0   76 22 6 1921.7 321998 -795672 52466.52997. -531 .0  75799  52  6152459.    .00     .0000000E+00
 FA 17  0   76 22 6 1926.7 322052 -795594 52468.52999. -531 .0  75893  50  6152469.    .00     .0000000E+00
 FA 17  0   76 22 6 1931.7 322106 -795517 52476.53002. -526 .0  75988  49  6252477.    .00     .0000000E+00
 FA 17  0   76 22 6 1936.7 322159 -795439 52490.53004. -514 .0  76082  52  6152490.    .00     .0000000E+00
 FA 17  0   76 22 6 1941.7 322212 -795360 52496.53007. -511 .0  76176  51  6152498.    .00     .0000000E+00
 FA 17  0   76 22 6 1946.7 322268 -795281 52511.53009. -498 .0  76273  50  6352514.    .00     .0000000E+00
 FA 17  0   76 22 6 1951.7 322323 -795202 52522.53012. -490 .0  76370  50  6352524.    .00     .0000000E+00
 FA 17  0   76 22 6 1956.7 322378 -795123 52528.53015. -487 .0  76466  50  6252530.    .00     .0000000E+00
 FA 17  0   76 22 6 2001.7 322433 -795043 52528.53017. -489 .0  76562  50  6352526.    .00     .0000000E+00

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