[gradsusr] Using shape files to mask seas and oceans

[Brian Gaze]

Hi,

I'm using a single shape file to try and mask out seas and oceans. The
relevant commands are:

set shpopts 12
draw shp 10m_ocean

However, the result is that in addition to the seas and oceans, some land
masses are colored in too. I've tried 2 different shape files (10m and 50m
res)  and the results are the same with both of them. I've also tried Open
GrADS on Windows and GrADS on Ubuntu but it doesn't make a difference.
(I've attached an image to illustrate)

Can anyone tell why this is happening? What am I doing wrong?

Brian
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