maby
Well-Known Member
You are quite right, of course!
AIS
- Thread starter poter
- Start date
You are quite right, of course!
pvb
Well-Known Member
No, the UK has 4 MIDs - 232, 233, 234, 235 - so already has about 4 million possible MMSIs. If we were to run out, it should be feasible to add another MID, as there are about 20 unallocated European MIDs.
rogerthebodger
Well-Known Member
MMSI is used to identify EPIRB's , DSC VHF Radios and AIS transmitters. It is also shown on the display of AIS receivers.
Linking yoy AIS receiver to a DSC VHF Radio allows you to make a DSC call without reentering the MMSI number
Some larger countries have more than one MMSI country code like the UK so can have several million MMSI identified vessels.
pvb
Well-Known Member
Very few radios have that capability.
rogerthebodger
Well-Known Member
All the Standard Horizon GX 2??? do. in fact they display the MMSI in a list in the order of CPA. My GX2000 that does not have an AIS receiver built in displays a list with an external feed so its just a software change foe most Radios that don't
pvb
Well-Known Member
Yes, the GX2000E and 2200E can call an AIS target direct, as can my Garmin VHF, but that doesn't change the fact that very few radios have this capability. And I don't think that many are able to have "just a software change".
[70521]
Well-Known Member
Thanks for clarifying that, I thought we only had one.
[70521]
Well-Known Member
My AIS set needs an MMSI number to be entered before it transmits a signal.
When I bought the boat a previous owner had entered a Swedish number, a simple figure transposition, and I had to ask the manufacturer how to re-set the MMSI to the UK one.
lpdsn
Well-Known Member
In theory with AIS transmitters that accept the NMEA0183 VDO sentence you should be able to send your MMSI within the encapulated message (6-bit encoded accordng to the ITU spec for AIS messages). I've not personally looked into any that work like this, but I presume there are some on the market somewhere.
maby
Well-Known Member
It requires an MMSI, but I'm pretty sure that is the MMSI of the boat's VHF - I don't think the AIS requires its own MMSI.
[70521]
Well-Known Member
Sorry, I assumed that everybody knew that an MMSI number is allocated to a vessel. My bad.
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[70521]
Well-Known Member
True, but my AIS kit is self contained as I have a none compatible VHF radio. I think it is only iCOM that send the sentence and I have a Standard Horizon.
rogerthebodger
Well-Known Member
On issue is the TCU never considered hand held DSC VHF radios. My HH DSC has my ships MMSI programmed.
Hoolie
Well-Known Member
Is that by choice or local regulation? It seems in the UK you can't do that and need to apply for a new number to be issued. See this YBW archived thread
pvb
Well-Known Member
That's correct.
FulmarJeddo
Well-Known Member
I think you only had one reply to this question. I have had an AIS receiver for a few years and found it both very useful and also annoying at times when the alarm keeps going off in crowded waters. I ended up with the alarms off most of the time. Anyway, I decided that I would upgrade to a transponder so there was a bit more of a chance of being seen in bad weather. When I was looking just after Christmas the best value for money seemed to be the Digital Yacht AIT 1500 from Cactus at just under £400. I bought it at London Boat Show and got a free antenna. It was straightforward to setup and configure by plugging it in to the USB of a PC. Mine is wired in to my Garmin plotter, but the instructions mention that if using it with a laptop it should be via the nmea cable. I presume you would have to use a serial to USB converter. It seems strange you can't use the same USB cable that you configure it with.
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pvb
Well-Known Member
If you're looking for cheap, you'll find it hard to beat the £349 Onwa KS-200A from JG Tech - http://jgtech.com/shop10.htm
SteveGorst
Well-Known Member
So it seems that transmitter/receivers are still a lot more expensive than receive only
https://www.ebay.co.uk/i/2827288557...=9045250&device=c&campaignid=974959912&crdt=0
the old model Quark A024 receiver for £86 or the new model for £104 vs £349 for the transmitter/receiver?
https://www.ebay.co.uk/i/2827288557...=9045250&device=c&campaignid=974959912&crdt=0
the old model Quark A024 receiver for £86 or the new model for £104 vs £349 for the transmitter/receiver?
Allan
Well-Known Member
I haven't read 100% of this thread but would like to add a recommendation. We had a Digital Yacht transceiver fitted "professionally". They programmed it as a pleasure vessel which is always under power. I worry that this could put us in danger in certain circumstances. I had one attempt to change it before we came out of the water, I'll be trying again before we go back in.
I think sailing vessel showing unspecified as propulsion is best we can expect. Someone told me their unit decided whether the engine was running by the supply voltage, on lots of modern boats, like ours, this would not work as the solar panels can take the voltage up. Why can't they just have a wire from the ignition switch?
Allan
I think sailing vessel showing unspecified as propulsion is best we can expect. Someone told me their unit decided whether the engine was running by the supply voltage, on lots of modern boats, like ours, this would not work as the solar panels can take the voltage up. Why can't they just have a wire from the ignition switch?
Allan
pvb
Well-Known Member
Does this surprise you? There's a lot more stuff in a transceiver, not to mention a separate GPS receiver.
