Index: /issm/trunk-jpl/src/m/coordsystems/gmtmask.m
===================================================================
--- /issm/trunk-jpl/src/m/coordsystems/gmtmask.m	(revision 27785)
+++ /issm/trunk-jpl/src/m/coordsystems/gmtmask.m	(revision 27786)
@@ -47,4 +47,6 @@
 	[status,result]=system(['gmt select ./' filename_all ' ' gmt_select_options ' > ./' filename_oce]);
 	if status~=0,
+		%assume we are working with GMT 6.0.0
+		gmt_select_options='-h0 -Df -R0/360/-90/90 -A0 -JQ180/200 -Nk/s/s/k/s';
 		[status,result] = system(['gmtselect ./' filename_all ' ' gmt_select_options ' > ./' filename_oce]);
 		if status~=0,
Index: /issm/trunk-jpl/src/m/coordsystems/gmtmask.py
===================================================================
--- /issm/trunk-jpl/src/m/coordsystems/gmtmask.py	(revision 27785)
+++ /issm/trunk-jpl/src/m/coordsystems/gmtmask.py	(revision 27786)
@@ -53,4 +53,6 @@
     outs, errs = subproc.communicate()
     if errs != '':
+        # Assume we are working with GMT 6.0.0
+        gmt_select_options = '-h0 -Df -R0/360/-90/90 -A0 -JQ180/200 -Nk/s/s/k/s'
         subproc_cmd = 'gmtselect ./all_vertices.txt ' + gmt_select_options + ' > ./oce_vertices.txt'
         subproc = subprocess.Popen(subproc_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)