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Offline RIROCKHOUND
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« Reply #20 on: December 27, 2006, 08:24:24 am »
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excellent! glad to have a geologist on board! thanx for chiming in!

good luck in your pursuits. (hope no boulders fall on you!) Grin
[/quote]

Nah, most of the boulders I work on are already underwater  Grin
We use side-scan, sub-bottom, single and multi-beam for environmental mapping....

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Offline Christian
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« Reply #21 on: December 27, 2006, 08:28:58 am »
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Welcome to the forum!

I wondered if you can give any recomandation on what brand to buy / use when it comes to Side Scan Sonars?

Best wishes,

Christian

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« Reply #22 on: December 27, 2006, 08:52:10 am »
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Quote:Posted by RIROCKHOUND

Nah, most of the boulders I work on are already underwater  Grin
We use side-scan, sub-bottom, single and multi-beam for environmental mapping....


NEAT!
what do you guys use for contoll underwater~as far as mapping goes??

like,do you put a crows foot in a rock~or pound a pk nail into rock or something??

i mean for accuracy,gps would be off big time. would you take a shot from ship to known control point then transfer to known cp underwater??

thanx~jeff Grin

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« Reply #23 on: December 27, 2006, 10:06:38 am »
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The Single and Multi-beam bathy mappers are fixed to the boat, so GPS and a Gyro compass OR RTK GPS makes it VERY accurate.  (cm's)
As far as side-scan and sub-bottom, in shallow water they are towed close to the boat, so you apply a correction from the boats GPS.  Pretty accurate, down to a few meters

AS far as side-scans, I'm a big fan of EdgeTech hardware and Chesapeake software, both easy to deal with companies.

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« Reply #24 on: December 27, 2006, 10:16:50 am »
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hey~thanx for quick reply!

cm is pretty close~but METERSaint. i guess you guys aint zactly doing a mortgage survey so being dead nuts hot isn't required Grin

good luck~n~dont drown down there! Grin

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« Reply #25 on: December 28, 2006, 08:15:36 am »
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Well.. I'll take you out in the middle of your favorite bay, cove, lake etc.. a few meters is pretty damn close... especially when you consider the efficiency of the systems (100m coverage per pass) and resolution (smaller than a milk crate)

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« Reply #26 on: December 28, 2006, 12:14:16 pm »
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Great info thanks for sharring...Smiley

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« Reply #27 on: December 28, 2006, 03:33:40 pm »
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Quote:Posted by RIROCKHOUND
Well.. I'll take you out in the middle of your favorite bay, cove, lake etc.. a few meters is pretty damn close... especially when you consider the efficiency of the systems (100m coverage per pass) and resolution (smaller than a milk crate)


biscayne bay!~ i think but not entirely sure is fav.maybe toss out a line while there.
red snapper makes a good lunch! Grin ~just fartin around Grin

thanx for all your input! ~jeff Grin

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« Reply #28 on: December 28, 2006, 04:51:07 pm »
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Hi Rockhound,

Do your scanners work.............no matter what the geological conditions are, surrounding the proposed target search area!??

Regards crowsnest.

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« Reply #29 on: January 02, 2007, 07:35:22 am »
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'Nest..
I don't quite understand your question?
Are you asking if they always are able to discern a wreck from bedrock, boulders or other 'Geology'?


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