[stuartsw]

Buying a Hunter 36'. She has a Raytheon chart plotter, etc., and on the advice of a sailing buddy ("cross the Straight once in a fog, and you'll....) am having 2k radar installed. My dealer is suggesting that instead of a radar target, I install "AIS", which will both send and receive information, heading, and likely crossings for commercial traffic in the vicinity.
It's a good chunk of change, but is it worth it?
Opinions welcome!

 

[jmolan]

Unless the rules changed, you cannot broadcast on AIS. However for $200 or so you can see an amazing amount of good info on the receive mode. It would be the best money I could spend in the electronics dept. Recieve only models are available for very little $$
In the Sound, if you get in a foggy or low vis. situation. Just call vessel traffic on VHF14 (I believe) and let them know who you are. They will keep you informed of any vessels. We did this clear out at Destruction Island before coming in the Straits. Combined with AIS you will be styling

 

[Zanshin]

If you get a Class A or B transponder you, too, can broadcast on AIS. Normally Class A is for commercial vessels, Class B for private ones. In order to broadcast you will need to have a MMSI assigned to you from your national authority, but that is pretty much it. I gather that the FCC has finally approved civilian AIS transponders

 

[pschoonveld]

AIS is no replacement for radar. Radar can show you fixed objects as well as moving. At this point, AIS is almost entirely just commercial. What about that fishing boat or other sailor that is out in the fog as well?

These are two very different tools, with very different purposes.

 

[stuartsw]

AIS is no replacement for radar. Radar can show you fixed objects as well as moving. At this point, AIS is almost entirely just commercial. What about that fishing boat or other sailor that is out in the fog as well?

These are two very different tools, with very different purposes.

Understood, and I am asking if I should ADD AIS to radar. It's the radar TARGET that would be substituted, according to the dealer. My concern is being visible to commercial traffic, which broadcast AIS would do.
You bring up a good point, pschoonveld.
Reading between the lines, radar will give me more knowledge of non-commercial traffic than AIS could at this point, given its newness for private/civilian traffic. And I hadn't thought of being visible to radar-equipped private traffic, who do not have the relatively new AIS. Perhaps I should go for a receive AIS module and a radar scatter on the mast.???

 

[windward54]

Class B AIS was recently approved for use in the United States, and Raymarine has come out with their add on for their systems. Not cheap, and I hear there may be an issue with some of the larger commercial vessels monitoring the Class B signal. Friends of mine who have their boats in large commercial areas love at least having a receiver which is about half the price. I'm in a smaller harbor with little commercial traffic and have not seen the need to add AIS on yet. Radar serves my functions very well.

 

[Paul_L]

For a relatively small boat like yours, consider just adding an AIS receiver to the chart plotter. This will inform you of large traffic in your area along with their course/speed and closest point of approach. You can get an AIS receiver for as little as $200, check Milltech. Radar will assist you in avoiding both larger traffic and small. In a 36ft boat it really doesn't matter that much if you get run down by a 300ft freighter or an 80 ft fishing boat. You are responsible for avoiding the collision via your own lookout.

Paul L

 

[negrini]

Have you ever tried to call out a freighter on VHF without any information? They rarely respond, right ? Definitely, its an interesting additional aid to your navigation tool set. Specially if you're not sure about that "big ship" manouvering; you simply call them by name/position/mmsi/etc and quite sure they will respond.It's true that some commercial vessels still don't carry a transponder, but certainly AIS will add to your navigational safety.

 

[firehoser75]

My 2 Cents Worth....

My advise actually depends on your budget or willingness to spend money. If money is no object, I would go with the radar, AIS that both sends and receives, and a good radar reflector. If money is tight, then my priority order would be: good radar reflector; radar; AIS receiving capability; followed by AIS send capability.
First, you need to be seen and second you need to see what is "out there". Radar lets you see more of what is out there than any AIS. However, knowing what large vessel traffic is out there, who they are, course and speed, etc. as is available with AIS is a very good thing (however, don't own it myself yet). AIS broadcasting is only as valuable as there are units out there receiving the info and more importantly paying attention to your signal. Commercial traffic may not be looking for you either on AIS or radar! If you can afford it, it is still a go thing.
Just my opinion,
Tom

 

[stuartsw]

Thanks, everyone. I ended up commissioning with both radar and AIS send/receive. The difference between receive only and send/receive has declined considerably.

 

[sailingdog]

You really want a good radar reflector, regardless of what else you put on the boat.

 

[MJBrown]

We just made two runs on the Delaware River and have to make one more before we're done for the season. The Delaware is loaded with commerical shipping and you have to pay attention. While you can manage well enough as is, having AIS to tell you the status that freighter or barge would be nice. I plan on adding it at some point in time, maybe spring when I add radar. Anyone have it already?

 

[negrini]

I have the Icom receiver and love it. Incredibly simple installation and plug-and-play. The anoying is it will transmit to plotter only when there is a transmitter nearby, if not, as my E120 doesn't know the reason of not receiving information it shows a "not operational" icon on display, leaving me guessing it's faulty or no ships nearby. Another NMEA failure for not defining a "ping" status of receiver as a default sentence, or an empty VDM transmition in case no transmiters at range ....

 

[MJBrown]

Negrini, where did you mount it on your B43? I have the same boat and thought I'd place it near the VHF and run the NMEA 0183 harness back to the E120.
Mike

 

[negrini]

Mike, my AIS is mounted behind VHF, inside the locker, laying flat on the left wall. Just removed antena from VHF and ran a 3 feet extention back to it. It's a good location as power and antena are available within inches. I was somehow lucky as St Barts had run the NMEA from E120 to VHF for lat/long DSC. I removed this data cable from VHF and moved to AIS. Since I lost the NMEA port on E120 (AIS NMEA is built at 38400 bps only) I'll run another cable from S3G back to VHF in the future. Indeed, I still don't have a MMSI number, so DSC can wait. I had also requested St BArts to provision a SeaTalk cable run to this location also, as I planned to install an internal ST60 repeater, so if I eliminate its external alarm I could use its NMEA out to feed back the VHF, eliminating the need to run such cable from AP. I didn't decide yet, let's see if I can overcome the hudge burocracy to obtain a MMSI down here ....

 

[MJBrown]

Negrini, I appreciate the info and will look to do the same thing. Sounds like you got lucky with the NMEA cable already in place. I'm pretty sure I'll have to run one through the conduit. I'd like to connect my VHF DSC to the GPS as well so perhaps I'll run a second cable. I forgot all about the MMSI #. I had one for the previous boat and submitted a request for the new one but can't recall if I ever received a response. Guess I better go through my paperwork on the boat.
Mike

 

[MJBrown]

Negrini, I checked the website and retrieved my MMSI #. Not sure why you commented about the burocracy, the web site makes it easy. Here's the site I used.
Mike
MMSI Registration for VHF/DSC

 

[jrd22]

Stuart- you won't regret getting both the radar and the AIS here in the PNW. If by radar "target" you mean a reflector, you definitely need one. The vast majority of the traffic out there will not be broadcasting on the AIS nor receiving yours.