With this command, contour plots can be produced which are
overlayed on map projections.

Widget:
- Select "Base Map" from the "Plot Background" menu. When the Map
Optons widget appears, use the left mouse button to click on the
Draw Map toggle button. The value of this button will toggle
between YES (the plot will be overlayed on a map background) and NO
(the plot will be displayed without a map background).
Command:
Arguments :
- choice: choice may be either ON or OFF. If choice = ON, all
subsequent plots will be displayed on the map background specified
by the command MAPROJ. If choice = OFF,
all subsequent plots will be displayed without a map
background.
Examples :
- DRAWMAP = OFF
Plots are displayed without a map background.
Notes :
- if a map projection has not previously been selected, the plot
will be drawn on a Cylindrical Equidistant map projection. this
option remains in effect until changed
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