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From: Ahmet (no email)
Date: Thu Jun 01 2006 - 14:40:57 EDT
The primary purpose is to navigate shallow dangereous areas.
The ranges can be more than a hundred yards, and they have built in alarms.
Transom mount does not work on sailboats. It is o.k for power boats.
at 10 ft/second, you have plenty of time to do evasive action for something that is 300 ft away.
The question is, what is the sea-state.As I said, waves will create clutter
Ahmet
Peter Ogilvie <> wrote:
I don't see them as being useful for avoiding danger at sea. If the range is only a hundred yards or even double that, you wouldn't have time to react. Someone would have to be at the wheel with the wits to initiate an instantaneous avoidance maneuver. Assume there is an alarm function so you don't have to study the display religiously to see the approaching container. Even with that, at 6 knots or so, just not enough time to react.
Containers do seem to be a growing problem. Pretty sure one got a boat and crew mainland bound from here last year. Someone with a son in the shipping industry said they lose 10% of the containers shipped. That's an outrageously large number so doubt if it's that high. These huge container ships that inadvertantly get into bad weather do lose a lot of containers, however.
Unfortunately, electronic warning or eye ball, these containers are nearly invisible with any kind of a sea running.
Aloha
Peter O.
Larry McNeil <> wrote:
Well - I tend to take the view that the forward looking feature is pretty much a major advancement over our normal sounders. I also REALLY like the application for letting me squeeze thru tough entrances - which the sounder just don't do at all. The issue of semi-submerged containers does not seem to me to really be an issue - lets see - containers are 12 feet or so minimum in an dimension - when containers are really going to be an issue, I would be most probably in deeper water, thus getting pretty goog forward range - specified as AT THE SURFACE - but the container is 12 feet down - seems to me I would see it pretty good! I am thinking logs and other shallow draft debris might be a challenge, but generally, these units seem very capable.
I did notice in scanning the links supplied that the interphase display is not as user friendly as the unit I had on the TMM charter. Problem is, I don’t recall the vendor for that one!
-----Original Message-----
From: "Richard Bradshaw"<>
Sent: 5/31/06 9:06:49 PM
To: ""<>
Subject: Re: [world-cruising] Interphase forward looking sonar
Yes. this is the one.
I've since heard that it still doesn't work too well and that post
was done in January of this year. However, that is one person's
experience. I've also heard that it works well and has at least on
one occasion kept a boat off the reef and in another allowed the boat
to enter coves they would not ordinarily go into. I'm beginning to
get the impression that for container/log/whale spotting it would
need to be calm seas to be worthwhile. Easing into unfamiliar
locations seems to be its strong point but I could be wrong. This is
just what I'm gleaning from the various points of view that I have
seen so far. For an ocean voyager not so great until you get there or
until you are in a heavily reef/debris strewn area. I'm still looking
for more info though. But it is looking like the cost is going to be
prohibitive for what it actually does. That is unfortunate because I
really like the general idea.
>Is this what we are talking about?
>
>http://www.interphase-tech.com/
>http://www.coursemaster.com/sonars/pcview.htm
>
>Cheers
>
>Dave
--
Rick
La Vita
1987 HC 33T #136
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