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Re: [PSUBS-MAILIST] Once again



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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