forward scanning sonar for container alarm - Page 2 - SailNet Community
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post #11 of 46 Old 11-29-2006
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The real problem is that a lot of the containers are lost near major ports, from what I understand. Hitting one in the open ocean is probably a pretty rare occurence, but the risk probably goes up a bit higher near major shipping ports.

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post #12 of 46 Old 11-29-2006
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THe only way my Catalina is going to make 20knots is on the back of a truck.
I am feeling safer about this whole forward facing sonar thing with every thread.
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post #13 of 46 Old 11-29-2006
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"The real problem is that a lot of the containers are lost near major ports"
Probably because the shipping lanes all converge on the major ports, so there's just more traffic losing cargo near them.
OTOH they claim most of the losses are at sea due to bad wx and improper stowage (it costs money to hire crew who can tie things down, right?) but what's lost at sea has far more acreage to get lost in.

What I don't understand is the position taken by maritime law, that the owners of this flotsam are not responsible for the damage it does. I can understand that concept--but this stuff isn't lost because of "the sea", it is lost because greedy owners are simply overloading ships and negligently failing to secure their routine cargoes. That's negligence, gross negligence, and people are supposed to be held responsible for that.
Even under maritime law.
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post #14 of 46 Old 11-29-2006 Thread Starter
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Quote:
Originally Posted by sailingdog
The real problem is that a lot of the containers are lost near major ports, from what I understand. Hitting one in the open ocean is probably a pretty rare occurence, but the risk probably goes up a bit higher near major shipping ports.
Maybe a lot of them, but not all.... check out the pictures at the end of this link! These probably ended up right on the way back from Hawaii to the west coast, until they sank.

http://www.cargolaw.com/2005nightmare_backhaul.html
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post #15 of 46 Old 11-29-2006
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A report from an experienced cruiser is "Interphase Forward-Looking Sonar. Good concept, difficult to use and understand the data. The jury is out on this one. "
http://www.setsail.com/s_logs/backhus/george119.html
I think hitting a whale might be more common than hitting a container, and vaguely recall a suggestion of using a piano wire attached to the bowsprit to set up a high frequency warning - who knows. It might be useful for coral, but a lookout except for singlehanders might be more reliable.
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post #16 of 46 Old 11-29-2006
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CHris,

Nah, a lookout isn't going to work, at all. After about a day at sea there is no way you can just sit there and stare ahead. I am doing good to glance around the horizon every 15 or so (though i will tell you the truth that I usually just glance at the radar). You would not know it until you hit it.

Poor guy that started this... all he wanted to know is if someone has ever used one of these... I think I screwed it up for him. Sorry about that.
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post #17 of 46 Old 11-29-2006
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Interphase unit is not what they claim, I have used one for two years off shore and it is not very definitive
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post #18 of 46 Old 11-29-2006 Thread Starter
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No worries, Cruisingdad - if I can't have information, I am always happy with a little entertainment!
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post #19 of 46 Old 11-29-2006 Thread Starter
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Quote:
Originally Posted by Dawkahab
Interphase unit is not what they claim, I have used one for two years off shore and it is not very definitive
Aha, some real information! What do you mean? Does it not see stuff you can see on lookout, like whales? Noise from the waves? What seems to be the problem?
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post #20 of 46 Old 11-29-2006
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I know two boats that use an interphase unit, but they use them to find submerged pilings while anchoring and to follow a channel entrance. I don't think they even turn them on at other times.
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