"The plume heights used in the modelling were underestimated and so were the hazard area, " it says.

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However, if the ball is covered by loose impediments and a player moves it in a hazard, or obstacle area, a penalty of one stroke applies.

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It's very difficult to avoid them so you could fly into them and there's an obvious hazard for helicopters in the area.

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Chelsea's first chance came in the 23rd, when an inswinging free kick was only cleared out to Eden Hazard, whose bouncing shot from outside the area went over Pantilimon but was cleared off the line by Vincent Kompany.

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At that point, the U.S. Coast Guard determined it posed a threat to other ships navigating the area as well as a potential environment hazard, he said.

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Ireland's Minister for Justice expressed concern that the new Apple maps identify a working farm in a residential area of suburban Dublin as an airport, a potential hazard for pilots.

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