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Forum: Seamanship & Boat Handling

17-01-2016, 04:02

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

I agree with you.
They are all professional, competent and caring of small boats, when they can be seen.

This doesn't include some Indonesian ferry drivers and Greek coasters and ferrys. The...

Forum: Seamanship & Boat Handling

15-01-2016, 05:09

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

Pollux,

I disagree that the constant changing speed and course is as problematic as you describe because AIS only transmits once per 30 seconds so the effective plot is fairly well averaged.

My...

Forum: Seamanship & Boat Handling

14-01-2016, 11:09

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

Plus, as we have discussed its difficult to judge distance at 1 nm being 500 meters out, so how can you do it at 6nms? That's a 1.5nm error!

Finally, how could you do that when avoiding 3...

Forum: Seamanship & Boat Handling

14-01-2016, 07:46

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

Here is a great example why you eye is bloody useless by itself, or even 2 of them.
Just being sitting in the cockpit with a tall ship captain looking at 3 boats, anchored, and asking which of the 3...

Forum: Seamanship & Boat Handling

13-01-2016, 12:47

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

This is where you, as stand on vessel, can be chased around the ocean by a ship.

Most ships have a company rule of 1 nm cpa, so if you try to increase that to 2 miles they can just come back on...

Forum: Seamanship & Boat Handling

13-01-2016, 10:44

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

Don, don't be naughty. Of course he's not getting his life on it.

The stand on vessel has the ability to take evasive action till quite late.

I certainly do make plans in case the ships crew...

Forum: Seamanship & Boat Handling

13-01-2016, 04:55

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

Ships do change course a long way out if the can. I have seen some make the course change at 10nms, its just a minor change at that range!

The screenshot below is at 2:30 am showing 3 ships...

Forum: Seamanship & Boat Handling

11-01-2016, 10:20

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

Its coming in now. New York harbor approaches have AIS on the channel markers (either real of virtual, I don't know)

The future there will be many.
And at the cost of a physical channel marker...

Forum: Seamanship & Boat Handling

11-01-2016, 06:25

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980

Posted By MarkJ

Re: Over-Reliance on AIS -- Collision off Dungeness

Don't need to swim the Singapore straits... just walk on the polution!

Forum: Seamanship & Boat Handling

10-01-2016, 05:00

Replies: 217

Over-Reliance on AIS -- Collision off Dungeness

Views: 24,980