Index: /issm/trunk-jpl/src/m/plot/plot_overlay.py
===================================================================
--- /issm/trunk-jpl/src/m/plot/plot_overlay.py	(revision 19424)
+++ /issm/trunk-jpl/src/m/plot/plot_overlay.py	(revision 19425)
@@ -5,5 +5,9 @@
 import matplotlib.pyplot as plt
 import matplotlib as mpl
-from mpl_toolkits.basemap import Basemap
+try:
+    from mpl_toolkits.basemap import Basemap
+except ImportError:
+    print 'Basemap toolkit not installed'
+
 import os