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Search took 0.00 seconds. Search: Posts Made By: Dockhead
Forum: Seamanship & Boat Handling 28-08-2017, 04:13
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

I totally agree that "new stuff = good stuff", but different "new stuff" is more or less revolution and more or less convenience.

Radar = revolution
GPS = revolution
Chart plotter = convenience...
Forum: Seamanship & Boat Handling 28-08-2017, 03:32
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Did anyone say that? If someone did, I didn't notice it.

Obviously, you must keep a visual watch at all times (and by hearing -- "by sight and by hearing"). It's a legal obligation as well as...
Forum: Seamanship & Boat Handling 28-08-2017, 03:28
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Si-Tex NMEA2000 black box transponder. The same circuit board is used in most black box transponders on the market; AFAIK only Vesper has their own.

But the nav status categories are from the AIS...
Forum: Seamanship & Boat Handling 27-08-2017, 06:04
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Well, it's a "ship type" -- not its status at the moment. So you should enter "sailing" if it has sails, and leave it there. And if you see a vessel with ship type "sailing", that doesn't mean that...
Forum: Seamanship & Boat Handling 27-08-2017, 03:50
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

I see what you mean!

Thanks!
Forum: Seamanship & Boat Handling 27-08-2017, 03:37
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

How to deal with "clutter" is entirely relevant to the original theme of this thread.

How to avoid being confused by a multitude of targets depends on what kind of display you have.

Most AIS...
Forum: Seamanship & Boat Handling 27-08-2017, 03:26
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

You would never do that -- because Class "B" does not broadcast nav status at all -- Bobgarret is referring to TYPE of vessel, which is a different datum and which is part of the static data.
...
Forum: Seamanship & Boat Handling 27-08-2017, 03:20
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Well, I'm not talking about merely showing red or green or steaming lights in a line -- of course we all know that.

I can do a radar plot by hand, and aspect doesn't enter into it, although you...
Forum: Seamanship & Boat Handling 27-08-2017, 01:17
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

This is an extremely good point :thumb:.

But it's a highly advanced point and way over the heads of many of us, who are -- at best -- concerned with not trying occupy the same spot in the sea with...
Forum: Seamanship & Boat Handling 25-08-2017, 01:16
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Stopping can be a great move if you have a place to stop which is out of traffic. I do it often -- usually by heaving to. Or by making a 180 back onto a reciprocal course (probably better in most...
Forum: Seamanship & Boat Handling 25-08-2017, 01:08
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

You and I are in total agreement, that the Rules should always be respected and followed, and also, that almost everything you need to know about collision avoidance, is contained within them.

But...
Forum: Seamanship & Boat Handling 24-08-2017, 23:58
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Sure, it's "not that difficult" -- until it is. Most encounters with ships are not head-on, but sometimes you can't avoid them. If you are set up to pass behind a ship and find yourself still too...
Forum: Seamanship & Boat Handling 23-08-2017, 08:34
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

That an obviously intelligent person like you could so totally misunderstand the basics of crossing with fast ships, is evidence that this discussion is really worth having. It might even save your...
Forum: Seamanship & Boat Handling 22-08-2017, 00:27
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Common sense should work in harmony and balance with skill and knowledge, which are no less important than common sense for such a job.

But yes -- the Dutch coast is sinking below the horizon and...
Forum: Seamanship & Boat Handling 21-08-2017, 22:09
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Yes.

I think the whole system breaks down after a certain number of targets on different courses -- we just can't process that much information. It starts to become like four-dimensional chess....
Forum: Seamanship & Boat Handling 21-08-2017, 13:39
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Indeed!

Just don't try racing moves on ships!
Forum: Seamanship & Boat Handling 21-08-2017, 13:37
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

You didn't serve on the Fitzgerald, by any chance? :) Yeah, it's "very, very easy" :rolleyes:


180 feet is not far enough from a ship travelling at sea speed! You need to stop projecting lake...
Forum: Seamanship & Boat Handling 21-08-2017, 09:40
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Peace -- you are both right.

Yes, of course, the COLREGS certainly apply to multiple vessel crossings, and the first thing to do with multiple targets, is to think it through one vessel at a time...
Forum: Seamanship & Boat Handling 21-08-2017, 09:31
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

I think using the term "right of way" is unfortunate, but of course the substance of what you say here is absolutely correct.

In harbor entrances and approaches to harbors, where ships are coming...
Forum: Seamanship & Boat Handling 21-08-2017, 09:12
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

You have asked a very important question.

Why don't we discuss it in a separate thread?

I've written an answer here: Thread for Basic COLREGS Questions - Cruisers & Sailing Forums...
Forum: Seamanship & Boat Handling 21-08-2017, 07:55
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

This thread is on advanced topics, on one specific and narrow topic, actually. These comments are beginner level stuff, and it is a distraction. It's not to say that these questions are not...
Forum: Seamanship & Boat Handling 21-08-2017, 07:31
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Keep reading. This is good. The wisdom you seek is all in the Rules, in black and white, but you have to read them completely, and not just take a phrase or two out of context.

RAM (restricted...
Forum: Seamanship & Boat Handling 20-08-2017, 13:54
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Only if you really have a 0.00 CPA or are passing slightly behind. If you're passing slightly ahead, it might make the situation worse. To know the difference, even with AIS, you have to do some...
Forum: Seamanship & Boat Handling 20-08-2017, 13:28
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

The conflict between time and distance horizons of WAFIs, and those of ships' bridges, seems to me to be one of the fundamental problems of collision avoidance, too little discussed. I have thought...
Forum: Seamanship & Boat Handling 20-08-2017, 08:21
Replies: 169
Views: 17,475
Posted By Dockhead
Re: Collision Avoidance -- Dealing with Multiple Targets

Someone else mentioned the radio call, and I entirely agree that a multiple target situation is one of those cases where a radio call can be just about indispensable.

The thing is, though, you...
Showing results 1 to 25 of 39
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