[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PSUBS-MAILIST] Once again
How deep will you be diving?
How far will you be traveling underwater?
How long will you stay submerged?
Unless you're traveling long distances for days or weeks submerged, or only dive very shallow, dead
reckoning will probably more accurate. You can take into account currents when calculating your position.
IGS would probably be more accurate than both.
The tether will limit your ability to go any where (at least under the subs own power), also it will
create a hazard for you an others (rope is not a friend of the submarine).
If you planning a mid-ocean drift, this could useful.
Ian.
-----Original Message-----
>From: George Slaterpryce <gslaterp@hotmail.com>
>Sent: Apr 7, 2006 4:37 PM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Once again
>
>I'm trying to eliminate the error (or at least offset it a little bit) by drawing a circle in the diameter of the extra line let out and then finding the coords in the middle of the circle.
>
>Still at no time with the degree of error be any greater than the length of the teather + the degree of error that an GPS system has. I think with the extra step I take I could at least narrow it down by half.
>
>George Slaterpryce
> ----- Original Message -----
> From: Nomdae Plume
> To: personal_submersibles@psubs.org
> Sent: Friday, April 07, 2006 3:42 PM
> Subject: 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,
>
> NP
>
>
>----------------------------------------------------------------------------
>
> 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
> >
> >
> >
> >************************************************************************
> >************************************************************************
> >************************************************************************
> >The personal submersibles mailing list complies with the US Federal
> >CAN-SPAM Act of 2003. Your email address appears in our database
> >because either you, or someone you know, requested you receive
> >messages
> >from our organization.
> >
> >If you want to be removed from this mailing list simply click on the
> >link below or send a blank email message to:
> > removeme-personal_submersibles@psubs.org
> >
> >Removal of your email address from this mailing list occurs by an
> >automated process and should be complete within five minutes of
> >our server receiving your request.
> >
> >PSUBS.ORG
> >PO Box 311
> >Weare, NH 03281
> >603-529-1100
> >************************************************************************
> >************************************************************************
> >************************************************************************
> >
>
> ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 311 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003. Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.
If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.
PSUBS.ORG
PO Box 311
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************