Coast Survey to Resove Magenta Line Issues

MarineLink.com
Tuesday, January 14, 2014

The Office of Coast Survey has announced that future editions of nautical charts of the Intracoastal Waterway will be updated to include an improved "magenta line" that has historically aided navigation down the East Coast and around the Gulf Coast. Additionally, Coast Survey will change the magenta line's function, from the perceived "recommended route" established more than a hundred years ago, to an advisory directional guide that helps prevent boaters from going astray in the maze of channels that comprise the route.
 


The decision comes on the heels of a year's investigation into problems with the magenta line. In early 2013, after receiving reports of groundings by boaters who followed the line into shoals, Coast Survey started to remove the magenta line from Intracoastal Waterway nautical charts.



"We cannot deliberately include chart features that we know may pose a danger to navigation," explained Rear Admiral Gerd Glang, director of Coast Survey. "The problems of the magenta line's misplacement, which had been developing over the past seven decades, were aggravated when some boaters assumed that the line indicated a precise route through safe water - although it actually went over land, shoals, or obstructions."
 


The U.S. Coast and Geodetic Survey, a NOAA predecessor agency, first installed the line on nautical charts in 1912, when the advent of motor boating produced a demand for charts of the inland waters and shallower waters along the East Coast. The magenta line on Intracoastal Waterway charts received major updates in 1935, thanks to an influx of funding from the Great Depression's Public Works Administration. Charts rarely recorded updates of the magenta line in the ensuing 70 years.
 


Boating public wants directional guidance
In 2013, while Coast Survey cartographers were removing poorly placed lines from charts that were undergoing regularly scheduled updates, Glang ordered a cartographic review of the magenta line's function and maintenance. Simultaneous with an internal review of the issues, Glang issued a Federal Register Notice asking for public comments. Almost 240 individuals and organizations offered comments, saying that the line helped safe navigation on the Intracoastal Waterway.
 


"We asked Intracoastal Waterway users to let us know if they need the route designated on nautical charts, and the response was 99.9 percent in favor of keeping it on charts," Glang said. "Many of the commenters explained how the magenta line saved them from dangerous or costly navigation errors. They also confirmed that we need to clear up any misunderstanding about what the magenta line is - and what it isn't."



The internal review and public comments confirm that the magenta line needs to be removed where it poses a danger to navigation, rebuilt to avoid shoals and other dangers, and reinstated to all the Intracoastal Waterway nautical charts. Importantly, Coast Survey will add notes to the Intracoastal Waterway charts, emphasizing that vessels transiting the waterway should be aware of changing conditions and always honor aids to navigation.



Improvements will take years to fully implement
"Today's decision to reinstate the magenta line is not a quick fix," cautions Captain Shep Smith, chief of Coast Survey's Marine Chart Division. "It will take at least three years to fix problems that were 70 years in the making."
 


Of Coast Survey's 1052 nautical charts, 52 depict the magenta line. As charts are rotated through the update process, Coast Survey will evaluate and update the magenta line using charted information. When no depth soundings are on the chart, the line will generally be positioned in the centerline of dredged channels and natural waterways, avoiding shoals or obstructions less than the controlling depth. When the chart data is insufficient for determining the line's preferred route, Coast Survey will attempt to gather additional data from partner agencies and reliable crowdsourcing.



"Most of the magenta line can be re-drawn by using the charted information, and we hope to get it done by mid-2015," Smith explains. "On the other hand, resolving discrepancies between charted information and the line will require research, and new data acquisition and processing, with support from other federal agencies."



Resolving chart discrepancies is a longer-term challenge, Smith says, and can conceivably take up to five years, or even longer. In cases where information is lacking and the line depiction can lead to risky navigation, Coast Survey will remove the line.
 

 

Maritime Reporter April 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

US Approves Ferry Service to Cuba

The United States Treasury Department has authorized passenger ferry services to Cuba for the first time in more than a half-century, in a major step in improving relations between the two countries.

Targa: Splitter, Terminal with Noble Still Under Consideration

Targa Resources Partners LP is working closely with Noble Group as Asia's biggest commodity trader evaluates whether to move forward a deal to support a Targa-built condensate splitter,

Aqueos Adds OSV to Service Line

Aqueos Corporation, a provider of subsea services to the Gulf of Mexico and Pacific Coast, has entered into a long term time charter of the OSV Clean Ocean, a California

News

Shipping Industry Faces Major Dilemma on BWM

The Round Table (RT) of International Shipping Organisations (comprising BIMCO, the International Chamber of Shipping, Intercargo and INTERTANKO) is deeply concerned

US Approves Ferry Service to Cuba

The United States Treasury Department has authorized passenger ferry services to Cuba for the first time in more than a half-century, in a major step in improving relations between the two countries.

Golar Mulls Third FLNG deal

Golar LNG has signed a binding Heads of Terms with Ophir Energy Plc for the provision of the GoFLNG vessel Gimi.   Golar has started discussions with partners

Surveyors

Stop Provocation on South China Sea, China Tells Philippines

China has urged the Philippines to stop "malicious hyping and provocation" on territorial disputes in the South China Sea, says a report in Xinhua.   Earlier,

Suezmax Tanker Market on the Rise Yet Again

Suezmax tankers are looking good for a strong 2015 year, before posting a mild downside during 2016, but are poised to accelerate yet again in 2017 on rising deliveries, said shipbroker Charles R.

Savannah, Ga. Opposes Offshore Drilling

The city council of Savannah, Georgia on April 30 unanimously approved a resolution opposing offshore seismic testing and oil drilling activities, the Savannah Morning News reported.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Navigation Offshore Oil Pipelines Port Authority Ship Electronics Ship Simulators Shipbuilding / Vessel Construction
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.2302 sec (4 req/sec)