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Old 05-25-2018, 04:11 PM   #1
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AIS do you turn it off

Do you turn your AIS off? Apparently this vessel travels at 57 Kts ......on the Interstate...
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Old 05-25-2018, 05:01 PM   #2
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Unfortunately too many people leave them on while tied up at the dock. You get so many hits that you can tend to ignore them. I wired mine in with the MFD so when I dock and shutdown the AIS goes off.
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Old 05-25-2018, 05:06 PM   #3
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Unfortunately too many people leave them on while tied up at the dock. You get so many hits that you can tend to ignore them. I wired mine in with the MFD so when I dock and shutdown the AIS goes off.

I really appreciate folks that do that.
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Old 05-25-2018, 06:09 PM   #4
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I knew Massachusetts Drivers have a reputation, but... wow!
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Old 05-25-2018, 06:13 PM   #5
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Is ais a requirement over there?
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Old 05-25-2018, 06:15 PM   #6
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Mine, and most I’ve seen are on all the time.

Having it on does not create a problem, and can even provide a ownerr with a remote indication that all is well on his boat while he is away.
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Old 05-25-2018, 06:23 PM   #7
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Is ais a requirement over there?
Not with private ownership.
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Old 05-25-2018, 06:28 PM   #8
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Is ais a requirement over there?
Commercial vessels and over 65í have to have it. It is really awesome though and I would not go without it again. Crossing Lake Ontario the rain was coming down so hard the radar was in a white out. Saw a ship on AIS that was on a collision course with us. About that time the ship called us by name and told us that they were changing course to pass astern of us. Wonderful.
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Old 05-25-2018, 06:30 PM   #9
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Mine, and most Iíve seen are on all the time.

Having it on does not create a problem, and can even provide a ownerr with a remote indication that all is well on his boat while he is away.


I disagree that leaving them on doesnít necessarily create a problem. Having active AIS signals from boats that are not currently in operation can clutter up the AIS display in busy harbors reducing its effectiveness at its intended purpose, to help with collision avoidance.
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Old 05-25-2018, 07:52 PM   #10
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I disagree that leaving them on doesnít necessarily create a problem. Having active AIS signals from boats that are not currently in operation can clutter up the AIS display in busy harbors reducing its effectiveness at its intended purpose, to help with collision avoidance.
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Old 05-25-2018, 08:21 PM   #11
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AIS signals on boats not in transit don't bother me much because they are in the marinas next to other boats that are not moving. Every marina in my area has about 5 boats per marina who keep their AIS on.

Agree, AIS is a nice tool. The ability to click on a boat when offshore to find out if its a 200 footer or a 20 footer can be helpful in the dark.

New boat is getting an 8 ft. AIS whip that should be up by next week.
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Old 05-25-2018, 08:25 PM   #12
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I turn mine off at the dock, but leave it on at anchor, in the mooring field. Or tied between dolfins before a lock. Have seen some bone head moves at night by other boaters. If I'm not tied to a dock, the AIS and anchor light are left on at night.

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Old 05-25-2018, 08:41 PM   #13
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We turn ours off when weíre not underway, figuring why have something turned on when not needed.
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Old 05-25-2018, 09:03 PM   #14
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Another consideration for those that leave their AIS powered up while secured to shore...

AIS transmits in available "time slots". There is a pecking order for those slots. By securing your unit unless you are underway or anchored, you are allowing those navigating to use the time slots for the intended safety purposes.

Thanks to those who secure their units.

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Old 05-25-2018, 09:30 PM   #15
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Another consideration for those that leave their AIS powered up while secured to shore...

AIS transmits in available "time slots". There is a pecking order for those slots. By securing your unit unless you are underway or anchored, you are allowing those navigating to use the time slots for the intended safety purposes.

Thanks to those who secure their units.

Best Wishes
Are "time slots scare"? If not, does it matter? I leave mine on all the time.
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Old 05-25-2018, 09:55 PM   #16
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Having active AIS signals from boats that are not currently in operation can clutter up the AIS display in busy harbors reducing its effectiveness at its intended purpose, to help with collision avoidance.
AIS is useless in the harbor. Too many people leave them on. Great idea like DSC but implementation and lack of control limits practical usage.
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Old 05-25-2018, 11:29 PM   #17
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Another consideration for those that leave their AIS powered up while secured to shore...

AIS transmits in available "time slots". There is a pecking order for those slots. By securing your unit unless you are underway or anchored, you are allowing those navigating to use the time slots for the intended safety purposes.

Thanks to those who secure their units.

Best Wishes


That was my understanding as well. As the system gets overloaded, signals further out get dropped out. I think there is also a priority system for some class A systems. As they reach the limit of the number of targets they can track, they drop the class B signals. That doesnít affect me as I donít have a transponder, yet.
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Old 05-26-2018, 05:22 AM   #18
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I bet what you're seeing on the Marinetraffic app is not a true AIS but the pseudo-AIS one can activate using marinetraffic or boatbeacon apps on a phone or tablet and an MMSI. I use this on my boat but do not have a real AIS.

Occasionally, when I drive home from the marina, I forget to turn off the boat beacon on my tablet and it looks like FlyWright is cruising down the highway.
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Old 05-26-2018, 05:39 AM   #19
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Another consideration for those that leave their AIS powered up while secured to shore...

AIS transmits in available "time slots". There is a pecking order for those slots. By securing your unit unless you are underway or anchored, you are allowing those navigating to use the time slots for the intended safety purposes.

Thanks to those who secure their units.

Best Wishes
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That was my understanding as well. As the system gets overloaded, signals further out get dropped out. I think there is also a priority system for some class A systems. As they reach the limit of the number of targets they can track, they drop the class B signals. That doesnít affect me as I donít have a transponder, yet.
I don't think that's quite accurate. The busiest AIS port I've been is Norfolk, VA. The Navy leaves all their AIS units on when tied to the docks. There are maybe a hundred AIS units on within 5 miles and and several hundred units within my reception range as all the commercial ships, tugs, etc leave their units on whether tied to the dock or not. While I do have to turn my guard zone off, the accuracy of moving ships in the shipping channel doesn't seem to be effected.

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Old 05-26-2018, 07:12 AM   #20
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I disagree that leaving them on doesnít necessarily create a problem. Having active AIS signals from boats that are not currently in operation can clutter up the AIS display in busy harbors reducing its effectiveness at its intended purpose, to help with collision avoidance.

I like AIS, and use it often to understand and sometimes communicate with commercial or other traffic...

But there are so many boats without it that it hasn't become our main collision avoidance tool around here.

FWIW, our installer piggy-backed ours on the MFD circuit in a way that leaves the AIS transmitter always on... unless I rummage around to trip the breaker on that circuit. Don't completely remember why they did that, IIRC something about anchoring... but the result is that ours is usually on, even when we're in the slip.

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