Ships transiting U.S. waters are required to carry nautical charts, which they use to plan their routes for intended voyages.

途经美国水域的船舶必须携带海图，以用于计划预定航路。

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Accuracy and scale of nautical charts to be used.

使用海图的精确性和比例。

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D Accuracy and scale of nautical charts to be used.

使用海图的精确性和比例。

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Meanwhile, Lloyd's List says the issue of which nautical charts the captain of the vessel was using looks likely to be critical to his defence if he does face a criminal prosecution.

BBC: Concordia disaster: House arrest for Captain Schettino

Virgil Zetterlind, cofounder of nautical-charts provider EarthNC, says iPads make smart replacements for traditional marine chart plotters because they are multipurpose, power efficient, simple to use, readable in direct sunlight and easily updatable.

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