EPIRB, Where can I compare and get one?
#76
Posted 27 August 2009 - 09:46 AM
#77
Posted 27 August 2009 - 09:59 AM
#78
Posted 27 August 2009 - 04:24 PM
I presume by "strobe" we mean a signalling one, not a camera "flash" one? I can't remember the make of mine, but it's bog standard and I've had it below 400ft with no problem whatever.
A strobe is a strobe is a strobe. An intense pulse of light. Can be used to illuminate a nudibranch or signal your position to a boat or a plane. Camera strobes are extremely powerful compared to many other little "strobe" that are just a blinking light.
#79
Posted 27 August 2009 - 07:36 PM
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A strobe is a strobe is a strobe...
Um, what if your life depended on it? Flash intensity may not be nearly as important (or desired) to a helicopter pilot with night vision... as...
... "approved" survival strobes which will continuously flash so-many-times per minute, typically for 8 hours before the flashes begin to dim, and continue operating / floating even if the victim looses muscle control and/or consciousness.
It's also easier to play "Not it" with your dive buddy using a smallish life jacket style strobe than, a really big camera one.
(Maybe it's about time dive camera strobes should have a Distress Mode setting. It is the right color to signal distress, after all)
#80
Posted 28 August 2009 - 04:59 AM
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A strobe is a strobe is a strobe...
Um, what if your life depended on it? Flash intensity may not be nearly as important (or desired) to a helicopter pilot with night vision... as...
... "approved" survival strobes which will continuously flash so-many-times per minute, typically for 8 hours before the flashes begin to dim, and continue operating / floating even if the victim looses muscle control and/or consciousness.
It's also easier to play "Not it" with your dive buddy using a smallish life jacket style strobe than, a really big camera one.
(Maybe it's about time dive camera strobes should have a Distress Mode setting. It is the right color to signal distress, after all)
Most "strobes" that are used/sold in dive shops are not "survival" strobes like might be used in military or maritime survival suits. They are basically a flashlight with a repeater on them. If you know the heli is there, the pilot will not miss my camera strobe flash. And unless using an approved lifejacket, which a BC is not, your face will probably be in the water if you become unconscious, cause otherwise there is muscle tone present.
#81
Posted 28 August 2009 - 06:20 AM
A strobe is a strobe is a strobe
Except that a signalling strobe is designed to be visible from a wide range of angles and does not have a focussed beam, whereas a camera one clearly is focussed. And a camera one has precisely controlled timing, whereas a signalling strobe merely pulses at regular intervals.
#82
Posted 02 September 2009 - 07:32 PM
... "Although these EPIRBs also include a low power 121.5 MHz homing signal, homing on the more powerful 406 MHz frequency has proven to be a significant aid to search and rescue aircraft. These are the only EPIRB types which can be sold in the United States." ~ U.S. Coast Guard Navigation Center (Strong print added by the post-it; me)
"With a DF-430, we get lock-ons [to a 406] at 150 miles sometimes," Yarbrough says. "An aircraft that is locked on knows where you are. The pilot has a needle to steer by. That's a big step forward in rescuing you in a timely manner."
"The 121.5, by contrast, works only as a homing signal at short range -- often less than five miles, according to a Coast Guard Office of search and Rescue report delivered at the 2008 beacon manufacturers' workshop in San Diego."
"Starting with $2.6 million from its Integrated Deepwater System Program for modernizing aircraft and vessels, the Coast Guard began equipping its C-130Hs and Falcons with 406 MHZ homing equipment in December 2006. Now it is installing the gear on its helicopters. Evnetually all of its aircraft will have DF-430s."
~ Soundings, Real Boats, Real Boaters, (magazine - soundingonline), August 2009, "New technology improves EPIRB searches," pg. 39 and 41.
This bit is obviously, all relative to mariners in distress, not divers. That perspective might change when there are a lot more response ships with rescue aircraft aboard. C-130s and Falcons cannot pick-up anything out of the water. They can, however, be the aircraft launched from shore to locate a device that was activated 500 miles off the coast of Panama or around the Great Barrier Reef's 100,000 square miles of ocean. I will check the quoted part of the article for dyping erros later.
Edited by Wakemaker, 11 September 2009 - 11:35 AM.
#83
Posted 25 November 2009 - 06:51 AM
#84
Posted 25 November 2009 - 01:15 PM
That perspective might change when there are a lot more response ships with rescue aircraft aboard. C-130s and Falcons cannot pick-up anything out of the water.
Those multi-motor bus drivers do carry really cool life rafts they can drop that will change your survival time from perhaps minutes to days.
Edited by Capn Jack, 25 November 2009 - 01:19 PM.
Jacques Yves Cousteau
#85
Posted 02 March 2010 - 12:54 AM
#86
Posted 21 May 2010 - 11:35 PM
www.inmarsat.com/About/Our_satellites/default.aspx
If you have any information about how I-4 satellites are utilized in SAR or emergency calls, please post it. Navstar and NASA employees may be our best bet.
#87
Posted 17 September 2010 - 04:24 PM
Total number of U.S. SARSAT rescues for the calendar year 2010: 42
UPDATE:
I hope this message finds everyone well. It has been a very busy boating season in the USA. Stay safe over, on, in, and under the water.
Total number of rescues for the calendar year 2010: 188
As of 2010Aug23. (I think the offical link to the data is at http://uscgsar-onscene.blogspot.com/)
#88
Posted 18 September 2010 - 10:01 AM
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