Last voyage for Costa Concordia cruise ship

That would depend upon the scale of the chart used.

 

Also Im not aware of the AIS update time Once a minute...20 times per minute ???. The system must be dampened to prevent erronous reporting. AIS is not a navigation tool...its a reporting system .

 

passenger vessel that size is mandatory fit with ecdis, paper is for yachties

 

The update rate is dependant on the vessel speed
yes I agree but the AIS has your GPS data in it as in the same data you are navigating with unless you have diff data in your plotter
I will ask the SAM guys here in Singapore what kit they have( the boat has a full SAM supplied bridge)

 

class A update rate:
under 3kts = every 3 minutes
over 3kts to 10kts every 10 secs, change course its 3.5 secs
14-23kts its 6 secs, change course its 2 secs
anything over 23kts 2 secs

 

If the cartographer works under a standard that says data transfer onto chart must be within 0.01 inches of accurate location, on a chart with a scale of 1 inch = 1 mile the object plotted on the chart can be as much as 52.8 feet from its actual position. The greater the ratio, the greater the innacuracy. At a scale of 1 inch = 250k inches, the actual line may represent an inaccuracy of over 208 feet and that is assuming the cartographer (and the quality assurance editor) did a top-notch job.

 

That being said, getting within 1000 feet by chart navigation of any charted offshore hazard to navigation is just stupid.

 

yes too true but a modern chart ( god knows when that area was surveyed) will be done with dgps and soundings so can be accurate to under the 10cm very easily

 

The data is only as good as the pen that draws it, no matter how accurate. Even a printer is limited by the number of DPI it can print.

 

Hoytedow
Forget pencil and paper and move to the digital age
survey to ecids does not involve paper ( anymore) ( well ok raster does but vector charts do not)
Thes guys can update their own charts/database with their own data

 

Local news say that Schettino claimed to have stumbled in the crowd and fallen into a lifeboat. Gave me a good laughter.

 

Besides...the chart was clear, the radar dont lie ,your eyes work and youre simply foolish to navigate that close to the coast on any craft at night. The ship hit the island..not an off shore reef.

Regardless of navigation accuracy its just stupid to be that close to shore at night.... From the bridge of a ship its Not easy to see two guys in a little inshore wooden fish boat, many times you only see them when the fisherman throws his cigarette overboard and you spot its comet.

My EDICS Admiraily charts dont have sufficient detain of Giglio for close in navigation.

 

so if they only had admirality charts then I guess he's in the ****

 

Like Neotus and Salamackll, I was happy to find this expert site in the swamp of undetailed and incorrect media coverage of this event. It is a pleasure to hear real news first from those who understand the situation. Thanks to Daquiri and all of the other posters. With some experience in small boat sailing and (better organized) cruise ship journeys I am curious about the way one error in judgement after another brought things to this result.
One question: I see some references to crew having done a 'crash stop' by dropping one or both anchors, causing the ship to pivot into its current postion. I understand this as a theory, at least on a small boat, but having watched cruise ships anchor out from a port it seems unlikely this could be done so quickly, especially given the inexperienced captain and unresponsive and disorganized crew. The port side anchor is not visible in photos, since the bow is submerged. Thoughts on this? A brilliant manouver or just more stupidity?
Also I wonder about a previous post; why not just bring the ship (still heading north) alongside the jetty or run in to the beach as an emergency thing, is there some logic to the U turn they ended up doing?

 

My thought as well- see my post #179

Flat bottomed ship- head on beaching would have seemed like having the best chance of holding her upright as she filled...