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The current practice in the Navy is to plot a gps fix at a minimum of
thirty minute intervals and DR from that using dividers and rules. Most
ships also have some type of computer or laptop with navigation software
hooked into the gps but currently the use of paper charts is still
mandatory while we work thru the issues of transitioning to the use of
ECDIS (Electronic Chart Display and Information System) as the primary
navigation plot.

-----Original Message-----
From: Navigation Mailing List
[mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM] On Behalf Of Royer, Doug
Sent: Thursday, October 16, 2003 14:15
To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
Subject: DR plotting techniques

I would like to ask the members of the list who sail or pilot power
vessels
how or what techniques they use to find their DR pos. while underway.I
am
only interested in what methods you use and don't wish to get into a
discussion of accuracy as yet.
1.Do you use paper charts,rules and dividers?
2.Do you use mathematical methods such as the following:Lat=Lf + -
e[S/60(cos T*)] ; Lon.=Lon.f + - e[S/60(sin T*/cos Lf)]
3.Do you use chatplotters and gps?
4.Do you use a computer or laptop with navigation software and gps?
5.Do you use gps only?
6.Any other method not listed above or a combination of the above.
Steven,thanks for telling me your training.In future conversations I now
have a baseline and know how to frame my questions or discussions with
you.By the way,thanks for the work you did on the Lunar files.I hope to
make
some use of them.
Jared and Dave,I'll get the brand name of the LED nav. lights when I get
to
the yard this week to work on the skiff and post that info.

   

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