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Old 18-03-2018, 06:02   #1
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MOB iTag like LifeTag plugin oCPN idea

Hi everybody!

I have idea for a cheaper equivalent of the LifeTag system (Raymarine) or similar systems this type. Raymarine LifeTag
I would like to be able to use iTag bluetooth 4.0 tags. One marker is about EUR 2 / item - in this case: EUR 2 / person.
https://www.ebay.com/sch/i.html?_fro...kw=itag&_sop=2
How does should it work:
Each crew member wears a iTag marker during the trip. When person (marker) will too far from from the PC with OpenCPN:
1. OpenCPN ("iTag MOB" plugin) enables ALARM
2. "iTag MOB" sets the MOB marker (on the chart) in position ehere the yacht was at the time when contact with a man was lost.
Cons: no GPS - no actual current MOB position
Advantages: cheapness, alarm immediately after losing a man.


Does this make sense in Your opinion? Is it possible?


Unfortunately, I can't write a plugin ... maybe someone can, and would like to do it?

regards - Wbartoszy
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Old 18-03-2018, 07:11   #2
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Re: MOB iTag like LifeTag plugin oCPN idea

Isn't the tag supposed to transmit gps location over ais?

I don't have lifelines on my boat because I might grab one and it breaks.

What if computer speaker breaks, and no one worries while someone drifts away?
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Old 18-03-2018, 07:39   #3
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Re: MOB iTag like LifeTag plugin oCPN idea

Quote:
Originally Posted by boat_alexandra View Post
Isn't the tag supposed to transmit gps location over ais?
No, this isn't AIS-SART:
http://c470.jerodisys.com/470Lib/lifetags.pdf

Quote:
Originally Posted by boat_alexandra View Post
What if computer speaker breaks, and no one worries while someone drifts away?
Nothing. You have situation equal if you haven't any system. In Raymarine LifeTag (for 1000EUR?), the speaker can also break. :-)
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Old 18-03-2018, 13:49   #4
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Re: MOB iTag like LifeTag plugin oCPN idea

I prototyped this idea with some iBeacons and a bit of Python code a few months ago. The python code faked up an AIS SART sentence which was fed into OpenCpn. The Bluetooth side of things worked and looked promising but whenever OpenCpn received a SART activation message it started generating lots of MOB waypoints which eventually caused OpenCpn to become unresponsive and ultimately crash.

I raised this but was told it's the intended behaviour, so I stopped with the intention of getting back to it sometime. See http://www.cruisersforum.com/forums/f134/one-ais-sart-message-many-mob-waypoints-196636.html.

Aedan
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Old 05-01-2020, 13:42   #5
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Re: MOB iTag like LifeTag plugin oCPN idea

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Originally Posted by AedanC View Post
The python code faked up an AIS SART sentence which was fed into OpenCpn.
Maybe this MOB sentence https://www.nmea.org/Assets/21030814...0amendment.pdf
will be better?
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Old 06-01-2020, 06:12   #6
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Re: MOB iTag like LifeTag plugin oCPN idea

I was not aware of that sentence, it might be good but it all depends on OpenCpn and Garmin support since I feed to both of them.

As an update, I got it working as proto code and intended to test it on the boat last summer, however other more urgent things took over. I have the boat electronics here at home now so this would be a good winter to move it on a bit.
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Old 06-01-2020, 13:15   #7
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Re: MOB iTag like LifeTag plugin oCPN idea

By the way the OpenCpn bug referred to above has been fixed now.
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