Hi Brian,
Thanks for the e-mail. I hope more people will take the
time to read the documents and provide comments. I assume you are referring to
the LRIT communication document.
Please note the following text in the LRIT
communications document:
1.1.1.1
The parameters added by the LRIT
shipborne equipment include the latitude, longitude, Time Stamp when the
position was generated, and the shipborne equipment identifier. The “Format” of
these parameters as outlined in table 2 indicates how the parameters shall be
formatted while the information is contained within the LRIT message and does
not specify the format of how the shipborne equipment transmits the
information.
Regarding your concerns with the format of the
date/time... The only difference that I can detect between the date/time
you state and what is in Table 2 of the LRIT communications document
is the separators ("-" versus ":") for the year, month, day, hour and minute.
The separator used to separate the year, month, etc in the date stated in
table 2 is not important and in no way linked to the format coming out of the
shipborne equipment. The format is with respect to SOAP messages communicated
along the various LRIT communication segments. CSPs for the IDC shall have
to "build" SOAP messages complying with table 2 in the communications
document using the format from the ship borne equipment. The important thing
with the time stamp is that seconds are not transmitted.
Regarding your concerns with the format for latitude...
We had a discussion on your e-mail and the intention was to implement your
recommendation. I can't recall why the "seconds" component of the latitude
didn't change to decimal minutes with a precision of 2 decimal places. The
most likely reason is that I forgot to incorporate this change in the document
due to the numerous requests. My apologies on this topic. I will make the change
for latitude to decimal minutes unless someone raises a compelling reason not to
change. Any body from the Communications group recall if there was a specific
reason why we didn't make the change (Jilian, Guy, etc.)???
I would like to high light to everyone that these
documents are in constant flux as a result of many requests from different
inputs at the Ad Hoc meeting. Thus, it is important to fully read the documents
that come out of each meeting to ensure that any particular topic of interest is
addressed in a satisfactory manner.
Thanks,
Craig Hayley
System Engineer
Canadian Coast Guard
709-772-7740
Thanks, Tracy
In table 2 I note that
the format of date/time is still shown as YYYY-MM-DD-HH-MM. My earlier email
(attached) made comment on this. Also in Table 2, note appears to have been
taken of my comments regarding latitude/longitude position for Longitude only,
but ignores Latitude.
We must not start
requiring reformatting for transmitted data that is already designed into
existing shipboard equipment – PLEASE!
Many
thanks
Brian
Brian
Mullan
Head, Maritime Safety
Services
Inmarsat, 99 City Road, London EC1Y 1AX, UK
Tel: +44 (0)20 7728
1464
Fax: +44 (0)20 7728
1689
Mob: +44 (0)7711
495836
www.inmarsat.com
From:
ccglrit-gcclrit-bounces@lists.ncf.ca
[mailto:ccglrit-gcclrit-bounces@lists.ncf.ca] On Behalf Of Peverett, Tracy
Sent: 29 May 2007 22:27
To: ccglrit-gcclrit@lists.ncf.ca
Subject: [Ccglrit-gcclrit] June 12-14
meeting of the Ad hoc Working Group onEngineering Aspects of LRIT, Hamburg Germany
Second of two
e-mails
As promised, attached
please find the updated LRIT Communications specification.
Best
regards
Tracy
Tracy
Peverett
Senior Policy
Analyst
Canadian
Coast Guard
Tel:
1-613-990-4046
Fax:
1-613-998-3255
e-mail:
peverettT@dfo-mpo.gc.ca
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