Author Topic: AIS  (Read 6369 times)

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Offline phoenix

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Re: AIS
« Reply #15 on: September 16, 2008, 15:58:09 PM »
http://www.si-tex.com/html/ais_radar.html

It's a small unit with a screen that takes input from your VHF antenna (to receive ships' AIS info) and your GPS (to plot your relative position). But it doesn't have any charting capability.

Offline NathanBaron

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Re: AIS
« Reply #16 on: September 16, 2008, 16:24:05 PM »
Cool.  Never seen one of those.  Thanks for answering the dumb question...

Offline zde

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Re: AIS
« Reply #17 on: September 16, 2008, 16:27:36 PM »

Offline El NoNo

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Re: AIS
« Reply #18 on: September 16, 2008, 16:57:55 PM »
It's cool. As it's only a receiver. I makes no possibility to track our friends. So, I will not understood, while the Class don't approve this.
El NoNo
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Offline KeithW

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Re: AIS
« Reply #19 on: September 16, 2008, 19:56:46 PM »
Have a look at the NASA AIS radar thats one way of having AIS with range alarms but no computer.

Keith

Offline andreas

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Re: AIS
« Reply #20 on: September 16, 2008, 23:10:07 PM »
I think that any inprovements in safety should be allowed, AIS included. 

On my recent 1000er qualifier I was run over by ships almost every day(night) in the mediteranean. They ignore you even when they see you in brisk blue clear skys and calm weather. A "See me" would be good indead. But the advantage of receiving a idendification of another ship doesnt come to my mind.(other than the MerVaille) If you sail single handed in waters with lots of  trafic I would recommend any technical tool to make you visible to the professional shipping. But, it weighs and it is using power. If you only switch it on when needed ( when sleeping ) it should be ok. But but but,... finally you never have any kind of guarantee that the opponent really sees you ? How would you know 100% ? Other than checking by eye ?

Offline NicoG

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Re: AIS
« Reply #21 on: September 16, 2008, 23:17:39 PM »
AIS shows the course of the other boats too.

Offline KeithW

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Re: AIS
« Reply #22 on: September 16, 2008, 23:19:06 PM »
The advantage of receiving the identification is that it lists there MMSI callsign, with this if you have a gmdss vhf radio (which we all should have) you can ring an alarm on there bridge.

Keith

Offline KeithW

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Re: AIS
« Reply #23 on: September 16, 2008, 23:25:52 PM »
Also I believe anything that gives us more of a chance to avoid issues has to be better than expecting bigger less manouvrable ships to avoid us. The NASA AIS has the ability to create alarms for varying distances and with the range and bearing info it is very easy decide whats a problem and what isn't.

Keith

Offline andyd

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Re: AIS
« Reply #24 on: September 17, 2008, 00:08:33 AM »

The new Icom IC-M505 vhf has ais capability...
although it does require a plotter to view other ships information.
It's product catalogue is not clear though on whether it has an ais transmit only function...

Anyone know ??


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Offline NicoG

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Re: AIS
« Reply #25 on: September 17, 2008, 12:03:54 PM »
So actually its just an enhanced Mer Veille. Only Mer Veille reacts on every radar (little fishing boats) while AIS only the big boats.

How much for the nasa gadget ?
Around 325 Euro...
What was the price for a Mer Veille ?
326 Euro.

One thing extra, lots of VHF antennas loose there working.
How does it work with the spare antenna ?

I would not be surprised if they allow it in this kind of versions...

Though decision:
Ais shows heading and names, but lacks the tracking of smaller ships.
MV youre wondering where the ship is, but reacts on smaller boats.
Sea Me, handy for the bridge of the big boats, but you never know if it works or not.
« Last Edit: September 17, 2008, 12:07:20 PM by Leov »

Offline geoffd

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Re: AIS
« Reply #26 on: September 18, 2008, 11:42:07 AM »
Hi Guys,

Easy answer - have all three if you can. Mer Veille covers the gaps AIS misses. AIS gives you range, speed, bearing and MMSI of anything over 300 tons. SeaMe / ActivEcho, shouting loudly "Here I am". Think narrow, busy shipping lanes. (oh, that'd be the gap between Lands End and the Scillies, or the channel). Think night. Then think thick, thick fog - so thick you can barely see your masthead light from the deck. And then think about being able to hear the commercial traffic all around you.

Then ask yourself if perhaps 325 euros is not so expensive, after all.

Don't see the additional VHF antenna and associated wiring as an issue, really; in fact, it kind of spells "redundancy" to me. I'm all for that.

Offline zde

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Re: AIS
« Reply #27 on: September 18, 2008, 13:05:48 PM »
What you will see in the channel with your AIS :-)

http://www.shipais.com/currentmap.php?map=Channel

Offline NicoG

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Re: AIS
« Reply #28 on: September 18, 2008, 19:51:54 PM »
Thought it used the already there antenna.

Offline KeithW

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Re: AIS
« Reply #29 on: September 19, 2008, 09:59:40 AM »
You can get splitters to share the same antenna although you will get surprisingly good results even with very small aeriel, I have the NASA radar which I use just with a small rubber duck plugged direct in the back and it still gives me a good reception range of 15miles or so.

Keith