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Stephen,
I'm afraid what I use on "Persistence" isn't all
that exciting. All I have for navigation is a liquid filled automobile
dashboard compass mounted externally about 18 inches forward of the conning
tower. I also have a polished stainless steel mirror mounted at 45 degrees
above my hatch cover viewport. I probably could use a hand held GPS to get
a fix when on the surface but I don't have one. The mirror on top of my hatch viewport is so I can surface and
scan the horizon without blowing my main ballast tanks to get the conning tower
out of the water.
The Auto compass really works well. It's
nothing sophisticated but without it, once I left the surface, even if I went
straight down I had no idea what direction I was oriented once I reached the
bottom.
In clear water on a sunny day, you can see the sun
from the surface if your not too deep, or in pea soup. That gives you an
idea of orientation. If you have a chart of the water and are on a sloping
bottom that gives you an idea of orientation also.
Captain Kittredge once told me, if he wanted to
travel a certain course, he's first lay down a nonfloating line from a boat then
follow it along the bottom. Again, nothing sophisticated.
Truth being told, I've been following this thread
in hopes you guys had something inexpensive and better then I'm using.
Dan H.
----- Original Message -----
Sent: Saturday, April 08, 2006 8:02
AM
Subject: RE: [PSUBS-MAILIST] Acoustic
Triangulation
Stephen,
It seems to me the original question was for "precise" underwater
navigation. So I suspect Jay is talking about pulse beacons on the seafloor of
some type. I will defer to his expertise to elaborate but, I remember reading
about an expedition to pacific thermal vents using this method.
I can tell you that as a diver, even with GPS to guide the boat, I have
returned to many a same dive site only to have some trouble finding
my target again, especially small ones.
My Octopus, as a self reliant vessel, would only leave periscope depth
in sound phone contact with a surface escort to keep tabs on traffic, and will
navigate in known waters, on compass and depth finder (an acoustic
device). Someone with a research or salvage capable craft needs more
capability.
It would be interesting to hear from Dan H, as to how he navigates his
K350?
Joe
From: "Stephen Pearce" <sjpearceqld@bigpond.com>
Reply-To:
personal_submersibles@psubs.org
To:
<personal_submersibles@psubs.org>
Subject:
[PSUBS-MAILIST] Acoustic Triangulation
Date: Sat, 8 Apr 2006
20:16:23 +1000
I thought this
might be better as a separate string!
Jay K Jeffries
wrote: ?Let?s get a grasp on reality here, it is obvious that
many here haven?t spent a whole lot of time underwater whether scuba diving
or in a submarine or
Submersible.?
and ?Probably the most
economical solution is acoustic triangulation.?
As there seams to
be a desire and maybe even a trend towards larger subs (UC3, Euronaut, Spurdog and possibly others on the drawing board) can
you expand on your ideal system utilizing acoustic triangulation. Enquiring
minds and all that?..
Regards
Steve P
OWSI,
107386
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