An investigation into the grounding is ongoing, but Navy officials said in January that the U.S. National Geospatial-Intelligence Agency, which prepares the digital navigation charts used by the Navy, has reported the location of the reef was misplaced on a chart by nine miles.

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"We've got all of our charts into a digital format, " Clark said.

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This whole story however does point out the need for an overhaul of the charts system, as leaving out digital download data can skew the numbers dramatically.

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Many of them will be watching the Pompeii app's progress up the charts to see if this kind of digital venture offers one solution.

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Its patient charts and drug ordering are all-digital.

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The Official Charts Company said purchases peaked in the 1980s, before digital formats were established, when 640 million singles were sold.

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