Re: [PSUBS-MAILIST] Once again

George:

My first question regarding this is "how accurate do you need to be?" I think there's going to be some error regarding the position of your sub verses the position of your float. For example: drag is going to cause the cable to curve. (Think of the kite-flying anology) Also, wind is going to move the bouy around... so it might actually be overhead, beside, or ever in front of your sub.

I'm personally planning on going with the GPS-on-surface/IGS-submerged route. I'll be watching this thread to see what other folks post.

Take care,

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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