"We often put out alerts on obstructions to a navigation aid, " Rutherford told CNN.

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More recently he has made investments in music site Spotify, crowdsourced car-navigation aid Waze and waterproofing tech outfit HzO.

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The application features a simplified user interface and textual information that is spoken aloud using voice synthesis to aid navigation of the device.

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In 1675, the foundation stone of the Royal Observatory was laid at Greenwich in south London by order of King Charles II, to improve knowledge of the positions of stars and thus aid navigation.

CNN: Sunday,

It wasn't expected that it would one day challenge paper road maps as the preferred aid in navigation for civilians--especially civilians overseas.

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