NOAA’s new nautical chart improves safety for maritime gateway to the Arctic

NOAA Office of Coast Survey has released a new nautical chart for the Arctic, which will help mariners navigate the Bering Strait. Chart 16190 (Bering Strait North) incorporates precise depth measurements acquired recently by NOAA Ship Fairweather hydrographic surveys.

Coast Survey has also released a new edition of Chart 16220 (St Lawrence Island to Bering Strait).

“Our Arctic Nautical Charting Plan identified the need for 14 new charts in the Arctic,” explains Commander Shep Smith, chief of Coast Survey’s Marine Chart Division. “Chart 16190 was high on our list of priorities, since the Bering Strait is the maritime gateway from the Bering Sea in the Pacific Ocean to the Chukchi Sea in the Arctic Ocean.”

“Charting the gateway is absolutely vital for safe navigation, but it is more than that,” Smith says. “In addition to the very practical aspects, this chart also symbolizes an opening to the growing opportunities for maritime transportation in the Arctic.”

Charts 16190 and 16220 include recent hydrographic information in U.S. waters between Cape Prince of Wales and the immediate waters surrounding Little Diomede Island. They also include recent NOAA shoreline surveys of the Diomede Islands and Cape Prince of Wales.

NOAA Chart 16190
NOAA Chart 16190, Bering Strait North

Chart 16190 provides 1:100,000 scale coverage, including a 1:40,000 scale inset of Little Diomede Island. Chart 16220 provides 1:315,350 scale coverage. Prior to these charts, the best available information was from Chart 16005, at a scale of 1:700,000. At that scale, every charted depth was separated by about two nautical miles and the chart depicted only a handful of depths. Most of the old charted depths were from 1950 and provided incomplete information about the depths or possible hazards on the sea floor.

Chart 16190 is the second new chart resulting from the Arctic Nautical Charting Plan. Coast Survey created the first of the new Arctic charts, Chart 16161 (Kotzebue and Approaches), in April 2012. (See New Alaska navigational chart makes increased Arctic shipping safer.) Chart 16220 had previously been maintained by the National Geospatial-Intelligence Agency, but Coast Survey assumed responsibility for it in 2010.

The equivalent NOAA electronic navigational charts (NOAA ENC®) for 16190 will be available this summer. Watch for US4AK8D (Bering Strait North), and US5AK8D (Little Diomede Island). The 16220 ENC equivalent — US3AK89M — was created in 2012 and included the new Fairweather hydro.

Coast Survey’s Marine Chart Division is responsible for updating the nation’s 1,023 nautical charts. Chart 16190 was compiled by Kieumy Dinh and reviewed by Eric Wallner, under the management of Andew Kampia. Chart 16220 was updated by Pravin Shrestha (compiler) and Yan Xu (reviewer).

Coast Survey publishes new international chart for navigation between Florida and Cuba

As the nation’s nautical chartmaker, Coast Survey produces the country’s traditional paper charts for coastal waters, territorial waters, and the Great Lakes. We maintain the Print-on-Demand charts that you can purchase from OceanGraphix and East View Geospatial. We make the nation’s raster navigational charts (NOAA RNC®) and electronic navigational charts (NOAA ENC®). And the free downloadable BookletCharts. But did you know we produce international charts, too? NOAA has five international charts covering the Northeastern Pacific Ocean and the Bering Sea… and we just published our sixth, for the opposite coast.

International mariners entering U.S. waters around southwestern Florida now have a new international (INT) nautical chart to help ease their transit. The new chart, INT 4148, has the same information as Chart 11420, Havana to Tampa Bay, but the depictions are converted to the metric system. (Most U.S. charts use either feet or fathoms for depth measurements). INT charts also use some different symbology, so Coast Survey makes those modifications as well.

Chart 11420 - INT 4148
The image on the left is a close-up of Dry Tortugas on NOAA Chart 11420. The image on the right is the same area on INT 4148. Note that converting fathoms to meters results in different contour lines for the same area.

Starting in April, INT 4148 will be printed on the reverse side of Chart 11420. The  new chart will soon be available as a print-on-demand chart.

In 1971, the International Hydrographic Organization adopted the idea of a common, worldwide chart series (INT Charts) produced to a single set of agreed specifications. IHO encourages countries to publish INT charts, and to make them available to hydrographic offices from neighboring countries, so they can use them for comparison or compilation with their domestic charts. Regional Hydrographic Commissions coordinate the production of INT charts. This particular chart was coordinated by the Meso-American and Caribbean Sea Hydrographic Commission – where NOAA experts are committed to supporting international hydrographic cooperation.

Coast Survey’s Marine Chart Division is responsible for updating the nation’s 1022 nautical charts. INT 4148 was compiled by Christie Ence and reviewed by Brian Martinez, under the management of Mark Griffin.