Many thanks, Tracy
Ref "Revised Draft Technical Specifications for Communication in the
LRIT System", Table 2, "LRIT Positional Data (Position Report)
Messages".
The table is over-prescriptive and does not reflect what is actually
available and transmitted by current ships' equipment.
(1) Latitude and Longitude
Latitude and Longitude are taken from the inbuilt or onboard GPS and are
presented as Degrees, minutes and decimals of minutes (to 2 decimal
places)
e.g. 59 57.92' N, 30 14.20' E
which is 59 degrees 57.92 minutes North; 30 degrees 14.20 minutes East -
and perfectly adequate.
To require the format to be degrees, minutes and seconds would require
expensive changes to onboard equipment
(2) Time Stamp 1
Date and time are similarly taken from the inbuilt or onboard GPS and
are presented as Day, Month, Year, Hour, Minute
e.g. 16-SEP-06 07:04 (which is self-explanatory; seconds are not
transmitted)
To require the format to be year, month, day, minute and seconds would
require expensive changes to onboard equipment
Please ensure that the LRIT ad hoc engineering group reviews these
specific parameters and does not set over-prescriptive requirements that
could require expensive changes to or complete replacements of shipboard
equipment. We are not starting out to design new shipboard equipment, I
believe, and should accept the standard reporting formats that are
already provided by the existing equipment.
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(a)lists.ncf.ca
[mailto:ccglrit-gcclrit-bounces@lists.ncf.ca] On Behalf Of Peverett,
Tracy
Sent: 19 April 2007 20:56
To: ccglrit-gcclrit(a)lists.ncf.ca
Cc: Lawrence Sciberras
Subject: [Ccglrit-gcclrit] Further Documents for May meeting of Ad
HocEngineering Group - MALTA May 9-12
Hello,
Further to my earlier e-mail, attached is the Revised Draft Technical
Specifications for Communications for your review and comment.
Best regards
Tracy
Tracy Peverett
Senior Policy Advisor
Canadian Coast Guard
(613) 990-4046
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