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Greetings Ian and Sean, I have been interesting in knowing what depth some of the major brands of EPIRBs can go before they take in water past there seals for some time now. I've seen a special unit for releasing a EPIRB that is in a housing on deck of a boat, that releases the EPIRB when a water pressure sensor gets submerged to a certain depth. But I don't expect the depth to be much more then 30 fsw. I've never expected a EPIRB to work underwater. But since I wanted to put one or more on my distress buoy, I wanted to know if I needed to make a special small pressure vessel for it, and also how to make a antenna and connect it to the exterior of the said pressure vessel. Perhaps I could remove the existing antenna and move it to the exterior of said pressure pressure vessel. I worked up a model of one configuration of a syntactic foam distress buoy some time back, that housed a EPIRB without any extra pressure protection. It also has a VHF antenna, safety flag, and strobe lights on it. I'm working on a all stainless steel distress buoy configuration that will be even easier to recouple with the sub when submerged and house the EPIRB inside. Here is a link to the syntactic foam configuration. http://www.frappr.com/?a=viewphoto&id=2384531&pid=3967275 As far as manually releasing a EPIRB, I would prefer to be able to keep it tethered to the sub at all times to make it much easier locating the sub for the rescue team. But if you are to deep for the tether, I would like the option to manually release the tether so the EPIRB can go to the surface and send a signal to bring in the rescue team to the first GPS location the EPIRB sent. Then you may very well need a long range pinger for the rescue team to locate your exact position. "To accomplish great things, we must not only act, but also dream; not only plan, but also believe." ~ Anatole France Regards, Brent Hartwig > Date: Wed, 5 Mar 2008 12:14:07 -0500 > From: irox@ix.netcom.com > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] Home-Built Pinger > > > Hi, > > I don't think the EPIRBs are capable of locating a submarine underwater, > but more for providing guidance to surface vessels to get to your general > location, and more importantly I think, quickly raising the alarm that > you are in trouble. > > For subs with a reasonable surface range, I think both the EPIRB and > an acoustic beacon would be needed. Raise the alarm quickly and get > rescuers to your general location, then the acoustic beacon for pin > pointing the sub. > > I've purchased a "Underwater Acoustic Beason Model NA1" by the > Dukane Corporation, SeaCom Division, IL. It's an older model used > on air craft. Similar to the their new models: > http://www.dukcorp.com/seacom/Products/Beacons.htm > > Mine takes replaceable 9v battery. It looks like it would easy to > make a replacement endcap for it that allowed an external power > source and activation. > > I bought this off of Ebay for around $20. And here's the same one > on ebay again: > http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&viewitem=&item=360028503143 > > I've not tested mine yet, at some point I'll get a hydrophone so > I can listen for it and test ranges, etc.. > > Cheers, > Ian. > > -----Original Message----- > >From: "Sean T. Stevenson" <cast55@telus.net> > >Sent: Mar 4, 2008 11:44 PM > >To: personal_submersibles@psubs.org > >Subject: Re: [PSUBS-MAILIST] Home-Built Pinger > > > >Just a thought, but for emergency use (i.e. disabled sub), wouldn't the most > >effective solution be a registered 406 MHz GPS enabled EPIRB? If you could > >devise a way to manually deploy the EPIRB from the distressed sub, the GPS > >location is encoded in the digital signal, so the appropriate rescue > >co-ordination centre has access to that information immediately, and the > >EPIRB ID is associated with registration information which would contain a > >description of the vessel (submarine) and communication facilities. I don't > >know how much information you can file in an EPIRB registration, but > >certainly you can include emergency contact numbers, etc., through which the > >RCC could obtain a prepared rescue plan for your vessel, and task the > >appropriate resources with minimal delay. > > > >-Sean > > > > > > > >************************************************************************ > >************************************************************************ > >************************************************************************ > >The personal submersibles mailing list complies with the US Federal > >CAN-SPAM Act of 2003. 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