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

ENGADGET: Sprint and Code Factory team up to deliver free Android accessibility app

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

CNN: Navigation alert went out to pilots weeks before Buffalo crash

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,