P&I Urges Use of Parallel Indexing

Friday, September 01, 2006
The London P&I Club has said that two recent casualties may well have been avoided if the bridge teams of the vessels involved had made use of parallel indexing, a radar technique which can enable navigators to monitor continuously for cross track error. Writing in the latest issue of its StopLoss Bulletin, the Club says, “In one case, a bulk carrier was passing close by the edge of a busy anchorage while preparing to pick up a pilot. The master had approved a comprehensive berth-to-berth passage plan which confirmed that the ship would be subject to a strong, cross tidal stream on the last leg from the anchorage to the pilot station, and also identified an appropriate parallel index. “But the bridge team failed to set up the parallel index on the radar, and also failed to fix the ship’s position with sufficient frequency. The helmsman had been told to steer for a clearly visible landmark, but no-one realized that, while the helmsman had kept the foremast aligned with the landmark, the compass course was changing steadily as the ship was set off the intended track. The master had become distracted and, by the time he noticed the danger, it was too late to avoid a collision with an anchored vessel.” The second case highlighted by the Club involved a feeder containership which, during an approach to an inner anchorage, was required to pass relatively close to a charted coral reef. In this case, the ship had no formal passage plan and the master was unaware that a strong current ran across the intended track. Although the end of the breakwater provided an obvious target for use in a simple parallel index, no use was made of it. And that omission had been compounded by fixing only by GPS and at insufficiently frequent intervals. As a result, the master only became aware that he was off track when the ship grounded heavily, causing damage to the reef. The Club says, “Both these casualties illustrate the value of parallel indexing, in addition to the proper fixing of a ship’s position at appropriate intervals. In particular, parallel indexing provides ‘real time’ monitoring for cross track error between fixes, in that the radar target can be seen moving off the index line if the ship deviates from the track. “And the use of the technique in these two cases should have given the bridge teams early warning that their ships were running into danger.”
Maritime Reporter March 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Cruise Ship Trends

China Homeport for Latest Giant RCI Cruise Ship

Royal Caribbean International says that its latest cruise ship, 'Quantum of the Seas', will make its home port in Shanghai (Baoshan), China The ship will reposition to China in May 2015,

Holland American Line donates $100,000 to Desmond Tutu Peace Foundation

In honor of Archbishop Emeritus Desmond Tutu’s work to spread peace, justice and democracy around the globe, Holland America Line has made a $100,000 donation to

Cruise Industry Disappointed by Findings of Critical LMU Report

New research by the UK's Leeds Metropolitan University (LMU) claims the cruise industry is ignoring its responsibility to the environments and societies it visits.

News

Saudi SABIC Q1 Profit Falls 1.8 % On Product Prices

Profit at Saudi Basic Industries Corp (SABIC), one of the world's biggest petrochemical firms, slipped 1.8 percent in the first quarter of this year as lower

Korean Ferry Captain's Detention Could Extend As Death Toll Mounts

South Korean prosecutors investigating a ferry disaster said on Sunday they would seek to extend the detention of the ship's captain and two other crew by 10

First Bodies Recoved From Sunken Ferry

South Korean divers retrieved three bodies from inside a sunken ferry overnight, officials said on Sunday, the first time they have been able to gain entry to the passenger section of the ship.

 
 
Maritime Careers / Shipboard Positions Maritime Standards Navigation Offshore Oil Pipelines Salvage Ship Repair 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: 0.2411 sec (4 req/sec)