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Why an NMEA port on EPIRB?

Old 11-23-2016, 06:30 AM
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Default Why an NMEA port on EPIRB?

So- I just bought my first EPIRB, it's a Class-1 in a hydrostatic release cradle, and the cradle has wiring to connect the EPIRB to the NMEA output on a GPS/Chartplotter... I guess my question is - why? The EPIRB obviously has its own GPS/transmitter capabilities so, isn't this superfluous? Why is it there? I guess more importantly, do I even bother running wires for it?
Old 11-23-2016, 06:32 AM
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So it already has a signal when deployed. It saves a minute or two of acquiring the satellites.
Old 11-23-2016, 06:34 AM
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Originally Posted by debugger View Post
So it already has a signal when deployed. It saves a minute or two of acquiring the satellites.
Huh. Thank you, that makes sense
Old 11-24-2016, 04:03 AM
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Sounds strange. Wouldn't the EPIRB be non functioning (turned off) while in cradle.
Old 11-24-2016, 05:02 AM
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Originally Posted by keysdiver View Post
Sounds strange. Wouldn't the EPIRB be non functioning (turned off) while in cradle.

Yes, exactly, it would take a few minutes after activation to acquire position, if position instantly available through the NMEA port that start up time to acquire satellites is by-passed.


Jim
Old 11-24-2016, 05:11 AM
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Fascinating.



Personally, if I felt I ought to have a Cat 1 EPIRB, and bought this model,

I would absolutely "bother" to connect that feature.

When SHTF you want every advantage you can have.
Old 11-24-2016, 10:40 PM
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Optical and NMEA links to EPIRB's is fairly old hat, what is the make/model of this Epirb?
Old 11-25-2016, 01:11 AM
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Agree with Kerry re being 'old hat'.
The use of GPS IR interfacing was introduced 20 or so years ago, so that Lat Long co-ordinates could be inserted into the data protected fields (outside of the 16 digit UIN string) and transmitted when activated.

These EPIRBs became obsolete in favor of internal GPS models. The downside now is that the position of the vessel, which may have lost the IR data connection, depending on nature of distress, is not transmitting its current position.

IR light pen interface is currently used for programming many brands of EPIRB with ID, MMSI and User Data etc as it avoids opening it up to connect a programmer cable. This is what your case may have.
I would question though and suggest you make sure you have a GPIRB as opposed to just an EPIRB.
Old 11-25-2016, 04:15 AM
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Originally Posted by Kerry View Post
Optical and NMEA links to EPIRB's is fairly old hat, what is the make/model of this Epirb?
ACR/Artex

can't be certain its what the OP purchased,
but when I Googled "0183 EPIRB" it was the only one I turned up that was not a "legacy" product.


Old 11-25-2016, 04:31 AM
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Yes there is a 5th generation TAC for the RLB-36 (19/8/2016) that lists it with an int&ext nav device but not sure about the "next generation" claim or "breakthrough product", optical interfaces were a breakthrough in the mid 1990's so hard to fathom what this is all about really?.
Old 11-25-2016, 05:45 AM
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Originally Posted by Fwpratt View Post
ACR/Artex

can't be certain its what the OP purchased,
but when I Googled "0183 EPIRB" it was the only one I turned up that was not a "legacy" product.


Yup, this is the one, good guess!
Old 11-25-2016, 06:42 AM
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It was common to have EPIRBS connected via the optical nmea interface for years. However, the newest EPIRBS with fast acquiring internal gps's don't really need it. These optical connections were in use right up until this last generation of EPIRBS. The newest generation that just came out don't have them. No harm in connecting it on one of these newer EPIRBS. It will just start broadcasting your position in a few seconds rather than a minute.
Old 11-25-2016, 08:11 AM
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not all epirbs have GPS. for those that don't you can tell it where it is
Old 11-25-2016, 12:28 PM
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Originally Posted by mmerriman View Post
not all epirbs have GPS. for those that don't you can tell it where it is
That's not correct. The ones that don't have an internal GPS are mainly standard EPIRBs that use Doppler to be located. Only a few where popular at the time that used the IR interface to reprogram position every 20 minutes or so. As I said earlier, don't confuse a programming port with a data port.

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