A small triangle of bad PGS coastline can damage miles of good NHD coastline:
Look at the triangle island in this map before it disappears from the map:
http://www.openstreetmap.org/?lat=36.202004&lon=-76.45625&zoom=18
If you zoom gradually from 18 to 11 you can see how much damage a little triangle can do.
Discussion
Comment from drlizau on 24 January 2010 at 19:57
Congratulations on finding the rogue piece of coastline.