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 July 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

RS to Exhibit at SMM 2014

Russian Maritime Register of Shipping (RS) announced it will exhibit at Shipbuilding, Machinery and Marine Technology (SMM) International Trade Fair September 9-12, 2014 in Hamburg, Germany.

Green Marine, ACPA Partner to Reduce Environmental Footprint

Green Marine and the Association of Canadian Port Authorities (ACPA) have entered into a Memorandum of Understanding with the goal of jointly expanding efforts

SC Ports’ Earnings, Volumes Surpass Plans

July cargo volumes deliver strong start to new fiscal year SC Ports Authority reported 2014 fiscal year-end operating earnings of $14.3 million, 20.7 percent over the organization's financial plan.

Navigation

Ohio River Reopens as Oil Spill Clean-up Progresses

A 15-mile section of the Ohio River was reopened for limited traffic on Wednesday as clean-up of a 5,000-gallon fuel oil spill continued, the U.S. Coast Guard said on Wednesday.

VSTEP Delivers FMB Simulator to Danaos

Danaos Corporation purchased a NAUTIS DNV Class A FMB Simulator and Instructor Station for training of its fleet members.  The simulator will be delivered and installed

FARO 3D Documentation Conference

The FARO 3D Documentation Conference, to be held October 13-15, 2014, was created as a forum for sharing knowledge, best practices and insight into the world of laser scanning and 3D documentation.

News

Update to Fire Damage to Australian Patrol Boat

Armidale Class Patrol Boat HMAS Bundaberg suffered significant damage due to a fire which occurred on Monday, August 11, 2014 in Brisbane. The boat was undergoing

Water Monitoring to Continue at Western Gulf Ports

A water monitoring network that helps keep port traffic moving is the responsibility of the Conrad Blucher Institute (CBI) for Surveying and Science at Texas A&M University-Corpus Christi.

Green Marine, ACPA Partner to Reduce Environmental Footprint

Green Marine and the Association of Canadian Port Authorities (ACPA) have entered into a Memorandum of Understanding with the goal of jointly expanding efforts

Surveyors

Markey Equips Research Vessel Sally Ride

Named for the first American woman launched into space aboard the Space Shuttle Challenger, the Research Vessel Sally Ride was commissioned August 9 at Dakota Creek Industries (Anacortes, Washington).

MN 100: ABS Group

16855 Northchase Drive Houston, TX 77060 Tel: (281) 673-2945  Email: kevenson@abs-group.com Website: www.abs-group.com President & CEO: David Weinstein The

American Club Issues Steel Cargo Warning

The American P&I Club has updated its advice to members on the handling of steel cargoes. It has done so in consequence of some recent cases where the absence of

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Port Authority Salvage Ship Repair Ship Simulators
rss | archive | history | articles | privacy | terms and conditions | 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: 0.1952 sec (5 req/sec)