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Using dead reckoning is Ok, but the problem is
currents, you don't know how far currents push you off course, you don't know
how they reduce your "Real" speed vs. what your sensor tells you your doing
against a current. I like dead reckoning as a system, I'm just trying to figure
out a way to get checkup points without surfacing. (you wouldn't run with the
buoy on the surface, you'd have to stop for that). It would be great for
instance for plotting major finds or updating your course.
George Slaterpryce
----- Original Message -----
Sent: Friday, April 07, 2006 1:43
PM
Subject: RE: [PSUBS-MAILIST] Once
again
George,
How about Dead Reckoning? Lousy name. but a simple concept. Sans sonar and
fancy nav equipment, substitute course, time and speed calculations. Submerge
at known location (A), steer 180 deg at two knots for 10 minutes, come to 090
for 5 minutes, surface at estimated location (B). I wouldn't try it on
the Andrea Doria but, for a calm lake somewhere with no traffic, it should be
fine.
Joe
From: "George Slaterpryce"
<gslaterp@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: "PSUBS
Mailing List"
<personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST]
Once again
Date: Fri, 7 Apr 2006 13:18:22
-0400
>Once again I come unto you the great PSubbers community
with my
>Thoughts, Musings and questions. Ye, Verilly... or
something.
>
>First thought, Problem, location underwater. How
to ascertain the
>exact (or as near as exact) location of an object
under water such
>as a sub. Problem is I don't know how deep you can
reliabley get a
>GPS signal. So I thought of this solution that may
not be the most
>elegant but I think it would get the job done pretty
well.
>
>GPS Bouy on a teather released form depth to the
surface.
>You know the depth to the surface, so whatever line you
released
>over the depth would be your varience. From there you could
get the
>GPS location, calculate two more points on a circle path,
then find
>the center point of that, which would give you your GPS
location.
>(Illustration below)
>
>(or if you can't see
them)
>http://www.captovis.com/marine/designsketches/uwloco.png and
>http://www.captovis.com/marine/designsketches/uwloco2.png
>
>Seem
like a good idea to anybody else? comments? Detractions?
>Improvements?
>
>George
Slaterpryce
>
>
>
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