You can get coastline data in Mapgen or Matlab format from NOAA's Coastline Extractor at http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html.
Matlab vector maps are simply a series of x,y data points. Lines are
separated by a row containing NaN NaN. The array should start
with a NaN row as well. Output from Matlab with this command:
save filename.txt arrayname -ASCII
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