Archive for the ‘Great Lakes’ Tag

Great Lakes mariners get new NOAA nautical chart for St. Mary’s River   Leave a comment

Vessel operators transiting St. Mary’s River, between Lake Superior and the lower Great Lakes, have a new nautical chart to help lessen the dangers inherent in this narrow and complicated waterway. The first edition of Chart 14887 (St. Marys River – Vicinity of Neebish Island) is available this week as a paper print-on-demand chart, PDF, and raster navigational chart. The electronic navigational chart will be available by March, in time for the beginning of the shipping season. (UPDATE, 2/12/14: NOAA ENC US5MI50 is now available.)

Coast Survey has built the chart from original sources, providing the highest standard of accuracy for hydrographical and topographical features and aids to navigation. The chart provides large-scale (1:15,000) coverage of the up bound and down bound channels of the St. Mary’s River – one of the busiest waterways in the nation. Over 4,100 transits of commercial and government vessels move about 75 million tons of cargo through the 300-day shipping season.

Corrected shoreline, chart 14883

The red lines show the shoreline as depicted before the updates. NOAA cartographers are applying the corrected shoreline and feature positions to the new chart and new editions of current charts in the Great Lakes.

Chart 14887 uses updated shoreline data, collected with NOAA’s high tech remote sensing planes. (See National Geodetic Survey’s shoreline data viewer.) At the 1:15,000 scale, the positions of many of the features were corrected an average of ten meters from positions in prior charts, a vital correction for precision navigation by vessels that can exceed a thousand feet long.

Coast Survey also plans to issue new editions of the current four largest scale charts of the St. Mary’s River in late January. Charts 14882, 14883, 14884 and 14962 will have all new shoreline, updating the locations of features and aids to navigation. These updates for the St. Mary’s River follow 21 new editions for Great Lakes charts from Buffalo to Thunder Bay Island, around the Lower Peninsula to Milwaukee Harbor and Ludington. More updates are slated for 2014 and 2015.

Chart 14887 was compiled by Nathan Burns and reviewed by Laurie Bennett, under the direction of Marine Chart Division branch chief Andy Kampia.

Iron ore shipment on Lake Superior

Updates to NOAA’s Great Lakes nautical charts will benefit ships like this one, carrying iron ore on Lake Superior. Photo courtesy of Carolyn St. Cyr.

U.S. and Canada eliminate overlapping ENC coverage in the Great Lakes   1 comment

Countries issue advance notice for changes in electronic charts

To comply with internationally agreed practices, Canada and the U.S. have been eliminating overlapping coverage of electronic navigational charts (ENCs). New changes will soon take effect in the Great Lakes. Under the new ENC coverage scheme, each country is changing their areas of coverage so that only one country’s ENC is available for any given area at a particular scale.

These changes come into effect 0000 Coordinated Universal Time (UTC), on 22 February, 2013.

Coast Survey’s ENC Overlap webpage has images depicting changes to the ENC coverage in the Great Lakes. (Mouseover the images to switch between original coverage and revised coverage.) It also lists the revised ENC limits as agreed upon by Canada and the United States.

The U.S. and Canada are making these changes to comply with the International Hydrographic Organization Worldwide Electronic Navigational Chart Database principles. According to those principles, countries should avoid ENC duplication, with only one country responsible for producing electronic charts for any given area. The U.S. and Canada revised ENC coverage last year for overlapping regions in Pacific and Atlantic regions.

More information.

This is the original ENC coverage for Band 3. Go to our website to see revised coverage for all bands.

This is the original ENC coverage for Band 3. Go to our website to see revised coverage for all bands.

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