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

Cruise Ship Trends

Holland America Line Appoints Geivett as Director, Social Media

Holland America Line has hired Kathryn Geivett as director, social media. In this capacity Geivett’s primary responsibility will be to drive, plan and oversee

Editorial: Gettin’ Crabby with Deadliest Catch

As February is our traditional cruise shipping edition, naturally we’ve selected a fishing boat and two crabs for the cover. But as many of you may already know,

Her Majesty The Queen to Name Britannia

Her Majesty The Queen, accompanied by His Royal Highness The Duke of Edinburgh, will name the new P&O Cruises vessel Britannia in Southampton on March 10, 2015, P&O Cruises announced.

News

Vessel Sales: February 2015

Vessel sales for February 2015  - (as of March 1) as prepared by Shipping Intelligence, Inc., New York.   Date Reported - Vessel Name - DWT - Built -  - (Age)

First Ship to Load Soy at Tegram Bound for China

The first ship to load soybeans from the new Tegram terminal in the northeastern port of Ponta Madeira in Sao Luis, Brazil, will berth on March 10, local shipping agents Cargonave said on Tuesday.

Oil Storage at Sea Stalls as Profit Play Fades

Traders are cutting plans to use tankers to store oil at sea as the price incentive recedes, the global head of oil at mining and commodities group Glencore's said on Tuesday.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Naval Architecture Offshore Oil Pipelines Port Authority Salvage Ship Electronics Ship Repair
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: 0.2602 sec (4 req/sec)