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View Poll Results: Do you have AIS?
Type A 8 3.94%
Type B receive only 44 21.67%
Type B receive and transmit 123 60.59%
No AIS 22 10.84%
Type B+ receive and transmit 6 2.96%
Voters: 203. You may not vote on this poll

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Old 29-09-2019, 13:45   #1
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AIS Poll

Do you currently have AIS, if so, receive only or transmit also? A, B or B+?

Class is the proper word instead of type. Please excuse the incorrect verbiage in the poll.

Looking for what you have installed now, not what you plan to have in the future.
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Old 29-09-2019, 13:53   #2
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Re: AIS Poll

There is no such thing as "B+ receive only"

I have none yet, buying a bog standard Class B before next season - or in case I see a decent wifi-enabled unit reduced beforehand.
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Old 29-09-2019, 13:53   #3
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Re: AIS Poll

Sorry, but I donít know the difference between the types. Maybe define them?
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Old 29-09-2019, 13:59   #4
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Re: AIS Poll

Quote:
Originally Posted by GTom View Post
There is no such thing as "B+ receive only"

I have none yet, buying a bog standard Class B before next season - or in case I see a decent wifi-enabled unit reduced beforehand.
I didn't think there was, but I am not 100% sure that's true. Thus I left in on the poll.

Quote:
Originally Posted by Mike OReilly View Post
Sorry, but I don’t know the difference between the types. Maybe define them?
Class A is commercial system with shorter intervals between broadcasting and 20w transmit power.
Class B is the normal recreational system with 2w transmit power.
Class B+ has upgraded 5w transmit power and supposed to have guaranteed broadcast time slot in busy areas (like Type A).

See https://digitalyachtamerica.com/product/ait5000/

NOTE ON SOTDMA TECHNOLOGY
Class B+ is a new generation of AIS functionality based on SOTDMA (self organised TMDA) messaging rather than the simpler CSTDMA (carrier sense TDMA). It guarantees your AIS transmission will get a time slot, even in areas of very high traffic density. It also specifies a 5W transmission power (compared with 2W for Class B) and a transmission rate that increases as the vessel moves faster. With regular Class B protocol, the transmission rate is fixed at every 30 seconds when the vessel is moving. It is ideal for ocean sailors requiring the best possible performance and future proof satellite tracking applications, fast power boats and smaller non-mandated commercial vessels. Please click here if you want to learn more about Class B+

All types described here. https://digitalyacht.net/2018/11/26/class-b-sotdma/
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Old 29-09-2019, 14:07   #5
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Re: AIS Poll

Thanks. So, assuming the B+ receive-only isnít a thing, then Iím good. SH2200 receive-only.
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Old 29-09-2019, 14:07   #6
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Re: AIS Poll

I voted, B transciever... but FWIW and depending on what you hope to learn from the poll... our equipment is 10 years old now, and if I were buying today I'd chose B+.

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Old 29-09-2019, 14:09   #7
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Re: AIS Poll

Quote:
Originally Posted by GTom View Post
There is no such thing as "B+ receive only"

I have none yet, buying a bog standard Class B before next season - or in case I see a decent wifi-enabled unit reduced beforehand.
Now that I realize how dumb I was, it can't be B+ and receive only. Not sure how to remove it from the poll.

Class B+ only helps on the transmit side.

Sorry for the mistake.
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Old 29-09-2019, 14:10   #8
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Re: AIS Poll

Quote:
Originally Posted by ranger42c View Post
I voted, B transciever... but FWIW and depending on what you hope to learn from the poll... our equipment is 10 years old now, and if I were buying today I'd chose B+.

-Chris
I updated the opening statements to try and clarify. My intention is to see what is currently installed.

Thanks for bringing that up.
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Old 29-09-2019, 14:12   #9
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Re: AIS Poll

Using app, so donít see poll. B transceiver. Vesper, of course!
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Old 29-09-2019, 14:28   #10
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Re: AIS Poll

Raymarine class b 5w transmit and receive
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Old 29-09-2019, 14:50   #11
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Re: AIS Poll

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Raymarine class b 5w transmit and receive
This one doesn't seem so.
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Old 29-09-2019, 15:24   #12
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Re: AIS Poll

Just for clarity, receive-only isnít AIS. Itís just snooping/ listening in. There is no standard, no specification, no nothing. Itís just listening in on what actual AIS devices are doing. AIS is a transmit/ receive protocol, period. Anything else is just being a peeping Tom.
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Old 29-09-2019, 15:51   #13
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Re: AIS Poll

AIS class B transmit.
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Old 29-09-2019, 17:20   #14
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Re: AIS Poll

Quote:
Originally Posted by GTom View Post
Hi Tom, I have the ais700 it transmits using class B SOTDMA network technology. Basically this gives it extra range, accuracy and it uses a transmit power of 5w.
I've had no problems with this system and love it.
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Old 29-09-2019, 17:25   #15
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Re: AIS Poll

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Originally Posted by Sardean View Post
Hi Tom, I have the ais700 it transmits using class B SOTDMA network technology. Basically this gives it extra range, accuracy and it uses a transmit power of 5w.
I've had no problems with this system and love it.
That's interesting, Raymarine labelled it wrong, SOTDMA+5W is the definition of B+ not B.



(see "Class B" on the device, B+ badge from the dealer, cactusnav)
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