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<DIV id=idOWAReplyText16474 dir=ltr>
<DIV dir=ltr><FONT face=Tahoma size=2><B>From:</B>
fifth-cg-dlnm-bounces@cgls.uscg.mil on behalf of
fifth-cg-dlnm@cgls.uscg.mil<BR><B>Sent:</B> Tue 20-Dec-05 08:57<BR><B>To:</B>
Fifth-cg-dlnm@cgls.uscg.mil<BR><B>Subject:</B> TIME SERVICE ANNOUNCEMENT SERIES
14 UTC TIME STEP<BR></FONT><BR></DIV></DIV>
<DIV>
<DIV><FONT face=Arial size=2>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">U.S.</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"> NAVAL OBSERVATORY
WASHINGTON, D.C. 20392-5420 July 27, 2005 No. 69 TIME SERVICE ANNOUNCEMENT
SERIES 14 UTC TIME STEP</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN></SPAN></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">1. The International Earth
Rotation and Reference Systems Service (IERS) has announced the introduction of
a time step to occur at the end of December, 2005.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">2. Coordinated Universal
Time (UTC) will be retarded by 1.0s so that the sequence of dates of the UTC
markers will be:</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">2005 December 31 23h 59m
59s</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">2005 December 31 23h 59m
60s</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">2006 January 01 0h 0m
0s</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">3. The difference between
UTC and International Atomic Time (TAI) is:</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">from 1999 01 Jan, UTC to
2006 01 January, UTC: TAI-UTC= +32s from 2006 01 Jan, UTC until further notice:
TAI-UTC= +33s 4. Information regarding current and predicted values of UT1-UTC
is provided in IERS Bulletin A.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">5. UTC and all time scales
based on UTC will be affected by this adjustment. However, Loran-C and GPS will
not be adjusted physically. Times of Coincidence for LORAN-C are available on
the Time Service Web Page (<A
href="http://tycho.usno.navy.mil/loran.html">http://tycho.usno.navy.mil/loran.html</A>).
For GPS, the leap second correction contained within the UTC data of sub frame
4, page 18 of the navigation message transmitted by satellites will
change.</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Before the leap
second</SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">GPS-UTC = +13s (i.e., GPS is
ahead of UTC by thirteen seconds) After the leap second GPS-UTC = +14s (i.e.,
GPS will be ahead by fourteen seconds)<SPAN> </SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Nauticast Navigations system
GmbH, the manufacturer of the NAUTICAST and NAUTICAST2 (certificate pending),
Nauticast X-Pack DS (USCG Type-Approval Nr. 165.155/0007/0), also know as the
ACR Global Watch UAIS, Global Watch UAIS2, Raytheon RM 808 AIS, Marine
Technology Bridge mate AIS, has issued a Technical Bulletin alerting customers
that the additional second will affect the performance of these systems, unless
a manual re-synchronization takes place between January 1 and January 2 (visit
<A href="http://www.nauticast.com/">http://www.nauticast.com</A>).<SPAN>
</SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Mariners are advised to
monitor any system that relies upon UTC (GPS, AIS, CELL PHONES etc., et al) for
timing or positioning for possible anomalous operation because this "leap
second" may affect the performance of other AIS units, as well as other
electronic navigation systems.</SPAN></P></FONT></DIV></DIV></BODY></HTML>