You're absolutely right, that's why I said "basically". Lots of exceptions to the "basic" rule, and in acutal practice you don't always know whether it's the rule or an exception until you get close enough to make it exciting.
So there are the Rules, and there are real-life experiences. It's real helpful to know both, and not just one or the other, when you're out there, whether as the mate on a ship, the exhausted singlehander, the preoccupied fishing captain, the tug mate with a long tow, or whoever.
I would look to the Rules, and to God's providence, and to the alertness and training of the other vessel, and not necessarily in that order, to get me, and the other vessel, through and intact.
Here is a link to one or the round the world racing groups. "--vendeeglobe.org/en/--"
It would be interesting to know what and how they address the solo sailing. I remember reading that the Aviva boat after demasting in a storm was almost hit by a fishing boat. The Canadian Racer determined that his auto pilot would jibe at random started sleeping in fifteen minute intervals in the cockpit. I believe his raider was ripped of during a particularly bad jibe. I know it’s not up for debate how they do it but this is a good site to read about it.
... There is no requirement to check or monitor the incoming data through the receiver -- the only requirement is that they broadcast the necessary AIS data.
The IMO has changed the rules, from 2008, the AIS returns must be overlayed on the ECDIS/radar on all SOLAS ships. So the chances of them detecting a yacht, which transmits AIS, will increase significantly. It still doesn't help with fishing vessels.
Idiens - but I think that ships have the option of not displaying AIS B signals (which is what most yachties have installed), whereis AIS A signals must be displayed. So in order to be certain you are visible you will need to pay the big $$$ for a full AIS A transmitter.
Six pages and 54 posts later it still comes down to one thing, you can not legally single hand a vessel - doing so means you do not have a proper lookout (SailAway's post point out a proper lookout is one where that is the only duty).
You can't even legally double hand a multi day voyage legally; two people are required to be on watch at all times, one working the boat one solely performing as a lookout.
Decades and decades of pleasure sailing has not changed the requirement, ergo there is no differentition between commercial and recreation.
Every single handed race is in fact a dangerous stunt. I don't see these folks as hero's I see them as reckless stuntmen/women.
Day and or night shapes would do nothing to relieve culpability and certainly wouldn't make that tanker not plow you under.
I wonder what would happen if you were sleeping while flying a 'not under command' shape and someone boarded you to salvage/offer assistance? I bet the courts would love that one. Obviously if you are aboard and the vessel is not under command you have abdicated as skipper.
Now pardon me while I go hoist the 'not under command' and 'vessel restricted in ability to manuver' shapes, go below and drink some rum.
Idiens - but I think that ships have the option of not displaying AIS B signals (which is what most yachties have installed), whereis AIS A signals must be displayed. So in order to be certain you are visible you will need to pay the big $$$ for a full AIS A transmitter.
I don't think so. The AIS receiver does not know if the signal is from a Class A or B. The rumour comes about because the coast guard stations can display different types of AIS targets selectively. Ships can just switch-off their AIS completely.
However, in such crowded conditions, where it might be desirable to unclutter the ECDIS display, are probably not conditions in which a SH sailor would go to sleep.
Idiens - I've heard conflicting reports, so started searching and found that for the MSC192(79)
Quote:
MSC 79/23/Add.2
ANNEX 34
Page 16
I:\MSC\79\23-Add-2.doc
5.26.3 Filtering of AIS Sleeping Targets
To reduce display clutter, a means to filter the presentation of sleeping AIS targets should be
provided, together with an indication of the filter status. (e.g. by target range, CPA/TCPA or
AIS target class A/B, etc.). It should not be possible to remove individual AIS targets from the
display.
This means that it is possible that Class B targets can be filtered even with the implementation of July 2008 SOLAS radars it is possible to have a strong AIS B signal yet still not show up on a ship's display. The 4-line ASCII screen does not allow filtering out signals, but I gather that no ships really look at those displays.
Zanshin - how is a sleeping target defined in that spec.? Plus is that for shipborne or shore use?
June edition of Yachting Monthly has Carruthers (RYA) specifically asked the UK MCA this point and being told by the MCA that Class B transmissions could not be filtered out by a Class A receiver.
However, there's a snag there too, as the receiver may not filter them out but the software in the ECDIS could.
This was from the official MSC documentation, it was for shipborne use and a sleeping target is defined as one that is not activated.
Quote:
A target symbol indicating the presence and orientation of a vessel
equipped with AIS in a certain location. No additional information is
presented until activated thus avoiding information overload.
I agree that the messages aren't filtered out by the receiver, but that doesn't mean that they will always be displayed. There were a number of interesting articles on the WWW on the differences between A and B and how B signals have other issues (2 times a minute vs. 30 times a minute among others) but overall I think I will go for a class B instead of the very pricey class A as one of my "please don't hit me" measures. Although with all the electronics I'm adding I might need to run my genset 24x7!
5.26.3 Filtering of AIS Sleeping Targets
To reduce display clutter, a means to filter the presentation of sleeping AIS targets should be provided,
I'm sure a good lawyer could twist this around to imply that sleeping is a sanctioned activity. Too bad Johnny Cochrain isn't still available.
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