T&T: AIS

[Troy Leek]

Dave
Where have you seen the class B receiver for $150?



> From: swansong at gmn-usa.com> To: trawlers-and-trawlering at lists.samurai.com>
Date: Wed, 12 Dec 2007 07:08:49 -0400> Subject: Re: T&T: AIS> > G'day Hans,
the Class "A" AIS is the one required for ships over 300 tons> and any
international passenger carrying ship.> > Alls Class B's are for unregulated
boats.> > All Class "A" units are transceivers. $3000 and up> > All Class "B"
units are transceivers. $1200 and up but this price may come> down once the
units are FCC approved in the US and the volume of units> increases. They are
currently CE approved and sold in the EU.> > One can purchase receivers that
receive both class "B" and class "B"> signals. $150 and up for single channel
receivers. $400 and up for dual> channels receivers.> > Few currently
installed Class "A" transceivers receive the full data stream> from a Class
"B" transceiver. This will slowly change as the software of the> class A units
is updated BUT there is no requirement for any operator of a> class A unit to
do so. A huge oversight, IMHO. In addition there is no> universal authority to
report ships with non working or malfunctioning units> to. Another huge hole
in the implementation and enforcement of AIS, IMHO.> > We have 2 AIS receivers
and one Class B AIS transceiver. One of the AIS> receivers we used to check
our own AIS signal which would otherwise require> another AIS ship to do so.
We also can insure that we are transmitting all> the data that we should even
tho the receiving ship may not be able to> receive it do to the lack of
software upgrades.> > We try to inform them of this but to date we have gotten
very poor if any> response to them being told that their AIS unit need an
upgrade. As there is> not potential to report them to anyone who can enforce
them to do so we> remain without our name and some other data not being
displayed. All seem to> get the MMSI number and our speed and heading. The
rest may or may not be> interpreted by their software.> > I have been in
contact with Ben Ellison, he is "Panbo", and have tried to> come up with a
database of who's class A transceivers receive what messages.> The ships are
stonewalling my obtaining this info as they either don't know> the status of
the software revision or just don't wish to deal with it.> However it seems
impossible to do this from my side.> > So we are grateful that we have it and
it serves a very useful purpose.> However its isn't the panacea that it could
be if all of the required ships> had it working and had the correct software
installed.> > Hope this helps a bit> > As always YMMV....> > Dave & Nancy>
Swan Song> Roughwater 58> _______________________________________________>
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