WASHINGTON: The January grounding of the minesweeper USS Guardian in a Philippine coral reef was caused in large part by a National Geospatial Intelligence Agency (NGA) map that was, quite simply, wrong by eight nautical miles, Breaking Defense has learned.

“It really was just a terrible fluke that caused the error,” NGA spokeswoman Christine Phillips said in a frank discussion of the incident and its aftermath.

The Sulu Sea grounding prompted NGA to order an agency-wide review of the nautical charts detailing the entire surface of the earth covered by the oceans. Also, NGA and the Navy have convened a team of maritime experts to take “an exhaustive look to make sure we are as sound as we can be,” Phillips told me.