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

People & Company News

WCI Applauds Increased USACE Funding

Today WCI applauded the leadership of Senate Appropriations Committee Chairman Thad Cochran (R-MS) and Senate Energy & Water Development (E&WD) Appropriations Subcommittee

SoCal Beach Cleanup Could Take Months

The U.S. Coast Guard captain overseeing cleanup of oil spilled from a pipeline rupture that closed two California state beaches and fouled offshore waters near

MPC Honors Crowley for Tank Vessel Safety

Crowley Maritime Corporation’s petroleum services division has once again been honored by Marathon Petroleum Company (MPC) with its annual Elite Vessel Award, which

Navigation

IMO Adopts Polar Code Environmental Provisions

United Nations' International Maritime Organization (IMO) has adopted the environmental part of the Polar Code. Hereby, internationally binding regulations on

NAVTOR AS, Nautic AB Launch Complete Navigation Solution

E-navigation specialist NAVTOR has joined forces with Nautic AB, a provider of navigational equipment, charts and publications to the Swedish market, to launch NAVTOR NAUTIC AB.

Launch of 'Eunavfor Med' Welcomed by BIMCO

The decision of the EU Council to launch EUNAVFOR Med* was today strongly welcomed by BIMCO, following the association’s statement on 24 April calling for an

News

DMW Marine Takes the Lead in Military Cranes

DMW Marine Group, LLC. has completed a number of projects for the U.S. Navy and foreign Navies in recent years, claiming a place as a go-to supplier for Navy departments globally.

US Oil Platform on Fire in Gulf Of Mexico

An oil platform caught fire and was evacuated in the U.S. Gulf of Mexico offshore Louisiana in the early hours of Friday, though no injuries were reported, the U.

USCG Tall Ship Sailing to the Bahamas

The U.S. Coast Guard Cutter Eagle is scheduled to arrive at Berth 14 at Prince George Wharf in Nassau, Bahamas on Thursday, May 28 as part of its 2015 cadet summer training deployment.

Surveyors

Carrier Schedule Reliability Improves in April

Transport consultant Drewry’s Carrier Performance Insight (CPI) for April records 67.6%, up by 4.1 percentage improvement on the previous month in the aggregate

China Denies Kra Canal Deal

China has denied it is involved in work on the Kra canal, defusing hype over a project that purportedly lets ships bypass the Strait of Malacca and Singapore's port, reports Strait Times.

Koden’s CVS-FX Echosounder Compatible with Olex

Koden Electronics Co., Ltd. announced that its CVS-FX series echosounders (CVS-FX1, CVS-FX2 & CVS-FX2BB) are now fully compatible with the Olex 3D navigation system.

 
 
Maritime Security Maritime Standards Pod Propulsion Salvage Ship Electronics Ship Repair Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
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: 0.2425 sec (4 req/sec)