/usr/share/gmt/x2sys/gmt.def is in gmt-common 5.3.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # $Id: gmt.def 12822 2014-01-31 23:39:56Z remko $
#
# Define file for X2SYS processing of GMT/MGG files
#
# This file applies to the GMT MGG file format.
# This format was developed by P. Wessel and
# Walter H.F. Smith at Lamont in the late 1980ies
# Utilities to deal with these files are supplied
# in the GMT supplemental package mgg
#
#---------------------------------------------------------------------
#BINARY # The input file is binary
#SKIP 18 # The number of header bytes to skip
#---------------------------------------------------------------------
#name intype NaN-proxy? NaN-proxy scale offset oformat
time i N 0 1 0 %10.0f
lat i N 0 1.0e-6 0 %9.5f
lon i N 0 1.0e-6 0 %10.5f
faa h Y -32000 0.1 0 %6.1f
mag h Y -32000 1 32000 %6.0f
top h Y -32000 1 0 %6.0f
#---------------------------------------------------------------------
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