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Old 12 April 2019, 13:39   #11
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AIS ....Aids Insecurity Sufferers???
......Maybe not.....
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Old 13 April 2019, 02:37   #12
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Not the same as AIS I know but I run an app on my iPhone called Boat Beacon. If you are meeting up with friends on the water and you are all running the app on your phones
it shows your locations boat names etc.

My wife finds it useful too as she knows where I am at sea. If you use the app and you have a mms I numer you can share your position with other full AIS users. (Which I did when I had a sailing boat)
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Old 13 April 2019, 03:28   #13
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Not the same as AIS I know but I run an app on my iPhone called Boat Beacon. If you are meeting up with friends on the water and you are all running the app on your phones
it shows your locations boat names etc.

My wife finds it useful too as she knows where I am at sea. If you use the app and you have a mms I numer you can share your position with other full AIS users. (Which I did when I had a sailing boat)
BoatBeacon is using AIS data though... so you'd want to know if it shows inaccurate locations.

@Willk - screenshot or more info? Wondering why it does it - and so fancied a wee nosey at a data log... #geek_alert
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Old 13 April 2019, 03:42   #14
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As a footnote - AIS is of huge importance to any boat with a MOB. In ISAF/RORC special regs for instance lifejackets will now have an AIS beacon signal that triggers when the lifejacket inflates. This MOB signal is seen immediately by any AIS receiver in range - unlike an EPIRB which can take up to an hour to pinpoint (and any vessel nearby is very unlikely to be able to receive an EPIRB emergency signal). I am of the opinion that AIS is one of the most innovative safety inventions in recent times.
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Old 13 April 2019, 11:03   #15
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As a footnote - AIS is of huge importance to any boat with a MOB. In ISAF/RORC special regs for instance lifejackets will now have an AIS beacon signal that triggers when the lifejacket inflates. This MOB signal is seen immediately by any AIS receiver in range - unlike an EPIRB which can take up to an hour to pinpoint (and any vessel nearby is very unlikely to be able to receive an EPIRB emergency signal). I am of the opinion that AIS is one of the most innovative safety inventions in recent times.


I think you may mean huge importance to serious racing yachts if the crew happen to be wearing a LJ at the time they go overboard...
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Old 14 April 2019, 15:50   #16
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Originally Posted by ShinyShoe View Post
@Willk - screenshot or more info? Wondering why it does it - and so fancied a wee nosey at a data log... #geek_alert
So, I was going to ignore this in case Poly butted in and went all OCD on it - but I'm sure you'll be more sympathetic...

I don't have any screenshots. I retain CCTV of Reportable Incidents, but not Quirks of the Internet. That said, if you select a vessel on Marine Traffic that is running over (let's say) 20 kts - mark it by a waypoint or nearby geographical feature and then zoom in and out a few layers. You'll be surprised to find it jump back and forwards. Or north and south, if it has taken a recent turn.
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Old 15 April 2019, 01:55   #17
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In the attached PDF I randomly chose two fishing boats - Fladda Maid (FM) and Stella Maris (SM).

The top two screenshots are at the same zoom scale and you can see the course, speed and update time of the two vessels.

I then zoomed in and did another two screenshots. FM has increased speed slightly and has changed direction. The position was updated three minutes earlier which is the same as the previous zoomed out screenshot.

SM is doing the same speed and direction but the update was carried out two minutes earlier.

To capture the screenshots, change the zoom and re-capture the screenshots took 30 seconds.

For FM, even though it's reasonable to assume both screenshots are based on the same position update time, the course and speed are different.

For SM, whilst the course and speed are the same, the position update only happened two minutes previously rather than three.

It's 'interesting' in a geeky way that simply zooming in and out changes the information in a slightly illogical way.

I'm off to get a life now.
Attached Files
File Type: pdf AIS.pdf (51.5 KB, 9 views)
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Old 15 April 2019, 06:40   #18
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I think you may mean huge importance to serious racing yachts if the crew happen to be wearing a LJ at the time they go overboard...
Not just racing yachts - most crews on different boats wear lifejackets today - and increasingly many cruising yachts / motor boats have simple Raymarine type MOB systems installed. The point is anyone with an AIS receiver (who is in proximity of an MOB wearing this system) can see the position of the MOB on their GPS. If you can afford to install this equipment why wouldn't you? If a single hander fell out a rib at speed (and was not able to get back to the boat) you have an outside chance of being spotted by someone with AIS if there are other vessels in proximity. The more sophisticated systems will also trigger an alarm to Solent Coastguard etc
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Old 15 April 2019, 09:42   #19
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Not just racing yachts - most crews on different boats wear lifejackets today
we must be circulating in different boating worlds! Am I wrong on thinking that even although ISAF/RORC are insisting this tech is fitted to the LJ they don't actually require the LJ to be worn?

Quote:
The point is anyone with an AIS receiver (who is in proximity of an MOB wearing this system)
i've highlighted the relevant bit in bold. My point which I am sure you are getting, but choosing to ignore, is that AIS is not "of huge importance to any boat with a MOB" but is a useful tool if you happen to have the AIS enabled personal locators on your LJ's and one goes overboard. Thats an argument for fitting the AIS locators to your LJ and logically to fitting an AIS receiver on your own boat - its not a great argument for me (or anyone else) fitting a receiver in case I'm close to MOB.
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Old 15 April 2019, 12:24   #20
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An interesting bit of thread creep which has been discussed before.

PLB vs AIS MOB

There is a combined unit on the market designed by that well known maritime nation - Austria.

https://seaangel.at/index.php?route=common/page&id=2906
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