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Old 02-02-2012, 22:11   #16
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Re: Best MOB alarm system?

on a tangient, how hard would it be to setup one of these systems to cut the motor and put the rudder hard to the side?
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Old 02-02-2012, 22:30   #17
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Re: Best MOB alarm system?

Well the kill switch can be found here:
Kill Switches - Dana Marine Products

I have no clue as to the rudder bit.
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Old 02-02-2012, 22:36   #18
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Re: Best MOB alarm system?

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Well the kill switch can be found here:
Kill Switches - Dana Marine Products

I have no clue as to the rudder bit.
Doesn't look like any of those would kill a yanmar
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Old 02-02-2012, 23:07   #19
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Re: Best MOB alarm system?

AHHH thought we were sailing whats this about engine shut offs !!! BnC
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Old 02-02-2012, 23:46   #20
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Re: Best MOB alarm system?

Trains have a dead man system that must be reset...too inconvenient when on watch however a bum bag with a waterproof VHF and instead of an engine cut-out gadget maybe a water sensing alarm in the bum bag with the alarm beside the mates bunk?

Hand helds are prob on most boats is there a siren actuator that can be put in the cabin?
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Old 03-02-2012, 00:20   #21
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Re: Best MOB alarm system?

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on a tangient, how hard would it be to setup one of these systems to cut the motor and put the rudder hard to the side?
Not a big deal at all. Just a tiny bit of code that listens for an MOB alarm on the NMEA bus, reads the true wind direction, and sets the autopilot course to the wind direction. To be fancy, set an intermediate course for a few seconds to make sure the boat heads into irons without jibing first, and wait xx seconds between the MOB alarm and sending the course change, to give someone time to turn the system off if there is a mistake. Anyways, then mount this in a low power single board computer or embedded machine that is on the autopilot circuit breaker. The motor kill is very easy and could of course driven by a relay into the kill switch on the engine control panel, the main detail, aside from needing to splice into the kill switch, it picking a computer that has an IO port to drive the relay. And then, while you're at it, it should have relays for the spreader lights and fog horn (so the hypothetical single hander can find the boat at night to swim back to it).
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Old 03-02-2012, 00:20   #22
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Re: Best MOB alarm system?

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AHHH thought we were sailing whats this about engine shut offs !!! BnC
Well, I was thinking of single handing, if it cut off the engine and rounded up it would cover all eventualities.
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Old 03-02-2012, 02:13   #23
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Re: Best MOB alarm system?

The MoBi-lert is also a very good system

East Marine - marine accessories equipment and repairs
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Old 03-02-2012, 04:03   #24
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Re: Best MOB alarm system?

Raymarine Life-tags will match our system.

http://www.raymarine.com/raymarine/S...eTag_Final.pdf
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Old 15-02-2012, 21:28   #25
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Re: Best MOB alarm system ?

msponer, could you slow that down a bit? Sounds very clever yet the explanation is way over my head.
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Old 15-02-2012, 23:01   #26
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Re: Best MOB alarm system ?

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msponer, could you slow that down a bit? Sounds very clever yet the explanation is way over my head.
Oh, sorry, I made it much too complicated and nerdy.

The easiest thing to do is find a nerd to add it to OpenCPN. Since it already has autopilot integration and is listening to the NMEA bus and etc. I don't know their code base, but it should not be a big deal at all unless there's just not a good place to reasonably bolt it on. I'm guessing that's not the case because of the feature set it already has, that there already is something very good to plug this into.

If I was at speed in this specific niche I would happily add this. But I have not done any "local code making a GUI" work in a very a long time, and am now specialized in other niches. So there'd first be this very annoying "dear g-d please just make this thing build" and "where did they hide the part that actually does anything?" phase that is a bit like banging your head against the wall, and I do not need more of that feeling right now, at least recreationally. PM me if you want me to help figure something else out -- this would actually be pretty easy to setup on one of those short project contract bidding sites, or these days, I haven't followed them, but I think there are even open source 'reward' type sites, a bit like Kickstarter. It should not be at all expensive. But there's also manners, of checking with the committers/owners of OpenCPN, and etc.
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Old 16-02-2012, 07:13   #27
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Re: Best MOB Alarm System ?

Thanks so much, the hunt for a nerd is the easiest solution for me. What a great introduction to the world of high tech (yes, I'm over 50 and know some 11 yr old kids).
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Old 21-05-2012, 22:47   #28
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Bit late for this, but I've just installed the Raymarine Lifetag system and I like it a lot. The provided buzzer, if you can call it that, will wake the dead. When I tested the system on the slip I had sailors from several boats away thinking it was some kind of fire alarm! It marks the plotter with a waypoint as well.
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Old 22-05-2012, 06:50   #29
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Re: Best MOB Alarm System ?

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All well and good, but if there's only two of us on the boat, one on watch and the other asleep, how would this system let the crew know that someone had fallen overboard?
Definitely a good idea in aiding the recovery, but without an alarm as the person hits the water, it's not a complete system. Unless I'm missing something?
if you have an AIS capable setup, then AIS SARTs are the best answer as they are auto alerting and provide a position. they are expensive around $400 each.

Dave
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Old 23-05-2012, 05:47   #30
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I tell any new crew to stay on board or most likely die! Nobody goes to the foredeck without waking up the off watch except me. I've lost too many friends on other boats.

Cheers, Greg
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