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DSC Group ID for THT members

Old 01-23-2007, 10:53 AM
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Default DSC Group ID for THT members

Having read the below thread on Group ID's for DSC it made me think why not set up a Group ID for THT members? That way assuming the discussion below holds true and any group DSC ID can be created by any individual (why not b/c the individual MMSI # is what is sent to the CG in emergency), why not come up with a # for THT.

Those wanting to DSC ping others on the water who are members of THT could do so via a group ID to see who else is out there and a forum member. It would also give alot of us some practice using DSC which many have but do not get the chance to use often.
Old 01-23-2007, 11:02 AM
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Default Re: DSC Group ID for THT members

Seems like a good idea to me...I wonder if we can create our own unique number or would we need to go through Boat/US?
Old 01-23-2007, 11:08 AM
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Default Re: DSC Group ID for THT members

Great idea. I think we need at least 3 boaters to do a test shot. If it works, publish the number for all THT members. I am still unclear on whether the group number is issued (by FCC/Seatow/Boatus) or made up.
Old 01-23-2007, 11:18 AM
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Default Re: DSC Group ID for THT members

Well according to my 504 manual and the discussion below it is simply made up. That makes sense b/c the individual MMSI is not the same as the group ID. My 504 manual says the group ID is a unique number made up by you. I will have to do some testing to see if programming the group ID auto joins you into that group but it makes sense to me.

No-one but those who share your group ID would receive the DSC request. The CG would only get your individual ID when you hit distress and your individual MMSI ID would not change.

Wiley, what do you think? I would love to know there are alot of other boaters out there who have DSC radios and are willing to try them out. Being that this forum is so large and popular it would give us a good opportunity to finally start using DSC and get some practice with it.


Old 01-23-2007, 11:25 AM
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Default Re: DSC Group ID for THT members

From what I've read we should be able to make up a group number. The MMSI is registered and has to be issued. However any fishing club or company or group of any kind should be able to create their own group to communicate internally. I think it is an awesome idea and I know there are plenty of THT folks here in NC that would use it if we can figure out the DSC part of it.
Old 01-23-2007, 01:22 PM
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Default Re: DSC Group ID for THT members

Good idea. I just added my MMSI to my signature.

If I start getting VHF-marketers calling, you guys are in trouble

Old 01-23-2007, 01:36 PM
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Default Re: DSC Group ID for THT members

New to me but I trust THT'ers to collectively do the right thing.

Old 01-23-2007, 01:42 PM
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Default Re: DSC Group ID for THT members

I can hear it over the airwaves now: Yamahas suck....no Verados suck....OMG, watch out for that Bayliner....So and so's cust service sucks.....etc etc and so on..."
Old 01-23-2007, 01:52 PM
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Default Re: DSC Group ID for THT members

We cuss and fuss a lot online because we are not out on our boats, THTers out on the water are a much more happy sort of folks!!!
Old 01-23-2007, 03:03 PM
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Default Re: DSC Group ID for THT members

Wasn't THT "Born" on 2/24/2001?

Maybe something like 022420011? Or 084884811 (0-T-H-T-T-H-T-1-1)

Does anyone know what the sequence used by the CG and Boat/US is? I would hate to see us inadvertantly use someone else's Group ID.

;?
Old 01-23-2007, 03:49 PM
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Default Re: DSC Group ID for THT members

Well I am still not sure if we would need to apply for a group ID but here is the CG group ID #'s. The U.S. Coast Guard group ship station call identity is 036699999, and group coast station call identity is 003669999.

According to the above web site any number whose MID starts with 338 is a U.S. ID number. Each country is assigned a specific MID which begins with any number between 2-7. Assuming we used a number beginning with somehting not close to Canada or Mexico's number I don't think we would run afoul of anyone. I don't know what Canada or Mexico's MID numbers are (even though we would have to be pretty lucky to hit one of them). The CG website listed in the thread below in its FAQ states that if your individual MMSI ID doesn't end with a 0 then you would need to apply for a group ID. I suppose that would be so you don't use someone elses like the CG or BoatUS.

I'll try and do some checking to see what the proper thing to do is and if Wiley says it is ok I will post it here. If anyone beats me to it then go ahead as long as Wiley approves. I am sure we could just make a number up that would work but that might not be the legal way to go.

Old 01-23-2007, 04:35 PM
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Default Re: DSC Group ID for THT members

We set up a group ID number on the north shore this summer and it makes things a lot easier because when we get OTW all we have to do is call the group # to see who is out there vs. calling each person individually. To make things easy we took one members MMSI# and altered it to be group ID compliant. I think all we did was add a zero to the beginning (I'll check) but it was that simple. Then everyone had to enter the # into their group ID on the VHF.

The number is made up and you do run the risk (very slim) of another group using your number. This is why we used an existing MMSI number and altered it because we figure it would be tough to come up with that # by accident.

You don't need to register the group # with anyone and you can literally set it up and have it working in a matter of seconds. The only thing you can't do with a group # is position request or position send to the group but you can still do this with the individual members in your directory.

Keep in mind that if you have hundreds of member sharing the same group ID it could get a bit confusing. I can see someone heading out and pinging the entire THT group and having every member in the geographical area reply on the VHF. It would jam the airwaves and you would spend all day chatting with everyone who responded. Plus, your VHF may be ringing off the hook with group calls that you have no interest in.

Personally I think it's great for a small group of less than 20 but that's just my opinion from having fooled around with it for the last 2 years. Good idea though!
Old 01-23-2007, 04:47 PM
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Default Re: DSC Group ID for THT members

Ok, here is the debacle. I called the FCC, they only issue MMSI's (the ones with zeros on the end that you can use as group ID's) for people who apply for ship station licenses. The fee for that is 160.00 and it is good for 10 years. BoatUS and SeaTow do not issue MMSi #'s with zeros on the end or at least mine don't have zero's. However, BoatUS and SeaTow get their MMSI #'s from the master FCC list.

The person I spoke with didn't think it would be an issue to use a BoatUS or SeTow number, however that isn't gonna work b/c it needs to have a zero on the front. A licensed number probably wouldn't work b/c it could be duplicated on a third party VHF once posted publicly. So the only option would be to make up a number and just try to use a country code from far away. However, I still don't know if that is totally legal and neither did the FCC person I spoke to. I suppose we could get a BoatUS rec number, drop the last digit and insert a zero as the first.

I'll bet that would work since I would wager all BoatUS MMSI's end with the same number for purposes of identification as a rec number.
Old 01-23-2007, 05:18 PM
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Default RE: DSC Group ID for THT members

marinerjoe's MMSI number is:

367-106-290

I'll bet if we ask him, he would give us permission to use:

036-710-629

as the official THT Group MMSI number.

It should not conflict with his individual number for individual hails or emergency use.

What say you Joe?
Old 01-23-2007, 06:57 PM
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Default Re: DSC Group ID for THT members

I think this would be great if it works.
Old 01-23-2007, 08:05 PM
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Default RE: DSC Group ID for THT members

Well I thinking about everyone write down the MMSI #, but start a new thread, let's go!!!!!





Old 01-23-2007, 09:51 PM
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Default RE: DSC Group ID for THT members

Well I would rather do this the proper way and not post everyones individual MMSI. Perhaps the best thing to do would be to contact BoatUS and see if they would issue a Group ID. That would resolve any issues. I assume they can since they issue recreational ID's and according to my call to the FCC the FCC only issues licensed MMSI's. Since we are only using a recreational number someone should issue us one. Region or not our DSC pings are only limited to the VHF range so the same number nationwide would work fine without cross talk. In a heavily boated area like SF you may get a few more pings than you want but you can just set your radio to "unable to comply," if it bothers you.

Even getting an individual MMSI and modifying it to a group ID would work I believe. The ID could be registered as a THT ID with no specific vessel being named. A corporate owner could hold the ID and therefore shift any potential liability for improper use to the corporation. As long as the registration for the ID is clear that it is a group ID and not meant to be interpreted as an individual I think proper safeguards would be in place. I would just hate for a prankster to get ahold of the group ID and modify it to a valid individual ID and send a distress. The safest thing would be to make up an ID and use it but then I don't think that is the proper way to assign yourself a group ID under the FCC regulations. Hence the problem with DSC. The system is really geared towards licensed boats and not recreational users who are exempt from licensing. Unfortunately the MMSI's we recreational users get does not transfer well into a group ID.

Let me see what BoatUS can do for us tomorrow so we can do this without worry. I for one am excited about hearing my fellow THT's ping my DSC and engage in conversation.

Old 01-24-2007, 12:16 AM
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Default RE: DSC Group ID for THT members

can hear it over the airwaves now: Yamahas suck....no Verados suck....OMG, watch out for that Bayliner....So and so's cust service sucks.....etc etc and so on..."

Old 01-24-2007, 06:34 AM
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Default Re: DSC Group ID for THT members

IMHO, since we are not programming this group MMSI into a radio as that radio's MMSI, we should be able to pick our own.

The odds are in our favor that the group number we pick isn't one that "belongs" to someone else. Also, it is not very likely that us THT members will be too large a group in any one geographical area.

I am leaning towards creating group MMSIs for us Tidewater Virginia Charter Boat Assn members, another one for our marina folks, etc.

The possibilities are endless...

Joe
Old 01-24-2007, 06:52 AM
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Default Re: DSC Group ID for THT members

Elusive - 1/23/2007 2:22 PM

Good idea. I just added my MMSI to my signature.

If I start getting VHF-marketers calling, you guys are in trouble
Wiley, how hard would it be to place a field for MMSI that would be visable in our profile, where you have the Yahoo,ICQ names?

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