AIS Poll

[FlyingScot]

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.

[GTom]

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.

[Mike OReilly]

Sorry, but I don’t know the difference between the types. Maybe define them?

[FlyingScot]

Originally Posted by GTom

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.

Originally Posted by Mike OReilly

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/

[Mike OReilly]

Thanks. So, assuming the B+ receive-only isn’t a thing, then I’m good. SH2200 receive-only.

[ranger58sb]

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

[FlyingScot]

Originally Posted by GTom

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.

[FlyingScot]

Originally Posted by ranger42c

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.

[Training Wheels]

Using app, so don’t see poll. B transceiver. Vesper, of course!

[Sardean]

Raymarine class b 5w transmit and receive

[GTom]

Originally Posted by Sardean

Raymarine class b 5w transmit and receive

This one doesn't seem so.

[tanglewood]

Just for clarity, receive-only isn’t AIS. It’s just snooping/ listening in. There is no standard, no specification, no nothing. It’s 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.

[chouliha]

AIS class B transmit.

[Sardean]

Originally Posted by GTom

This one doesn't seem so.

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.

[GTom]

Originally Posted by Sardean

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)