Underwater GPS

[DoUDive2]

This thread seems to have migrated into the subject of sonar. So, I did a bit of research and obtained the following information about costs and environmental impact:

Neverlost ($790)
http://www.st-josephscuba.com/gauges.htm

XIOS Eyesea ($900)
http://divestore.scubacenters.com/M...en=CTGY&Store_Code=SD&Category_Code=Computers
http://www.aquaticadistributors.com/Products/products.html

Desert Star Sport ($550) and Scout ($300)
http://www.scuba.to/cgi-bin/link.cgi?url=http://www.desertstar.com/sport.htm

Environmental Impact Article
http://seattlepi.nwsource.com/local/143166_whales09.html

Happy Easter!
Chris

 

[Don Burke]

None of these gadgets would be of any help on a survey.

The "environmental impact article" isn't the worst piece of trash I've ever seen, but it's pretty close. I suspect the reporter and the "scientists" could use a few weeks in a clue acquisition course.

This thread seems to have migrated into the subject of sonar. So, I did a bit of research and obtained the following information about costs and environmental impact:

Neverlost ($790)
http://www.st-josephscuba.com/gauges.htm

XIOS Eyesea ($900)
http://divestore.scubacenters.com/M...en=CTGY&Store_Code=SD&Category_Code=Computers
http://www.aquaticadistributors.com/Products/products.html

Desert Star Sport ($550) and Scout ($300)
http://www.scuba.to/cgi-bin/link.cgi?url=http://www.desertstar.com/sport.htm

Environmental Impact Article
http://seattlepi.nwsource.com/local/143166_whales09.html

Happy Easter!
Chris

 

[DoUDive2]

None of these gadgets would be of any help on a survey.

Agreed. Underwater surveying requires something along these lines:

Aquamap(TM) ($13000)
http://www.desertstar.com/newsite/price/pd012-c.pdf

Now I really like this!

GPS Intelligent Buoy Subsea Tracking System
(if you have to ask you can't afford it)
http://www.mkservices.co.uk/mks/files/GIB brocure.pdf

Chris

 

[ScubaDuba1]

Agreed. Underwater surveying requires something along these lines:

Aquamap(TM) ($13000)
http://www.desertstar.com/newsite/price/pd012-c.pdf

Now I really like this!

GPS Intelligent Buoy Subsea Tracking System
(if you have to ask you can't afford it)
http://www.mkservices.co.uk/mks/files/GIB brocure.pdf

Chris

Don't know if anyone has mentioned this device yet. Looks interesting, uses doppler velocity log and fluxgate compass. You enter your geodetic loaction (lat/long) as you enter the water and it keeps track of exactly where you go. Even records it for mapping.

http://www.rjeint.com/pdf/cobra_tac.pdf

Dont know how well it works, but it looked neat.

 

[Don Burke]

Don't know if anyone has mentioned this device yet. Looks interesting, uses doppler velocity log and fluxgate compass. You enter your geodetic loaction (lat/long) as you enter the water and it keeps track of exactly where you go. Even records it for mapping.

http://www.rjeint.com/pdf/cobra_tac.pdf

Dont know how well it works, but it looked neat.

I worked with a Doppler Sonar navigator made by Ametek-Straza. It was a pretty good machine. A couple of microprocessors would have done it a world of good.

On the linked page, they are saying that it acts like "a GPS receiver", which is downright wrong. It's a dead-reconing device. Such a claim makes me wonder about the company.

 

[hometone]

Does anybody know why they dont make an underwater GPS, I figured this would be something really kool, you would never have to worry about not finding a wreck, or the dive boat again.

Anyway just a thought.

Thanks

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go to www.longbeachdive.com

 

[HammerNoMore]

On the linked page, they are saying that it acts like "a GPS receiver", which is downright wrong. It's a dead-reconing device. Such a claim makes me wonder about the company.

Another example of how imprecise the English language is. I read the same thing but assumed they ment it emulated a GPS receiver. I.E. the UI is like that of a GPS.

James

 

[tfohl]

Does anybody know why they dont make an underwater GPS, I figured this would be something really kool, you would never have to worry about not finding a wreck, or the dive boat again.

Anyway just a thought.

Thanks

You can't even get a good GPS signal in a damp forest so I doubt that a simple unit would work well under water.

Tim Fohl

 

[rcain1]

Just dive with your wife. They know EVERYTHING! How could you get lost.

 

[The Kraken]

I think that calling the company a liar is a bit harsh.

What the company is offering is a powered antenna that will couple with a submerged GPS unit and transmit the signals from the geostationary satellites to the hand-held unit.

I have a Garmin 12XL with an external antenna. The current antenna cable length is about 8-9' long. I daresay that the resistance of an antenna cable 55' long would preclude the transmission of the data to the hand-held unit by existing antennae.

In order for the antenna to overcome the inherent resistance of the coaxial cable, it would have to generate an amplified signal.

So, that's what ya have. An amplified surface located antenna sending the acquired signals to the encapsulated, submerged GPS unit.