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### B.1.1.1 Optional file header records

The first data record may be preceded by 1 or more header records. When using such files, make sure to use the -H option and set the parameter N_HEADER_RECS in the .gmtdefaults4 file (System default is 1 header record if -H is set; you may also use -H nrecs directly). Fields within a record must be separated by spaces, tabs, or commas. Each field can be an integer or floating-point number or a geographic coordinate string using the [+-]dd[:mm[:ss]][WSNEwsne] format. Thus, 12:30:44.5W, 17.5S, 1:00:05, and 200:45E are all valid input strings.

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