This is indicated on marine charts for the region.

Detailed hydrographic surveys and marine charts were prepared.

Nevertheless, "Cloates Island" remained on some later marine charts and world maps.

In Meiji period, the naval important duty was defense of Japan homeland and make of a marine chart.

He glanced briefly at the dim coastline in the distance, then turned his attention to a marine chart.

Andy was leaning his elbows on the tilted surface of the chart table, mooning over a marine chart.

Where available, common marine nautical charts include visible representations of TD lines at regular intervals over water areas.

Meanwhile she was spending hours at the kitchen table poring over marine charts of the Ten Thousand Islands.

Turning his back on her, Keith returned to his marine charts.

It's amazing how many people are too lazy to read a fuel gauge, a compass, or a marine chart.