For anyone who's curious about what it means to "trap errors" in a mapping system, I found this on http://www.naturalearthdata.com/blog/natural-earth-version-1-

For anyone who's curious about what it means to "trap errors" in a mapping system, I found this on http://www.naturalearthdata.com/blog/natural-earth-version-1-3-release-notes/ http://www.naturalearthdata.com/blog/natural-earth-version-1...: Being centered at 0,0 (zero latitude, zero longitude) it is useful for flagging geocode failures which are routed to 0,0 by most mapping services.