hi all i live in se london and trying to to monitor AIS but dont seem to be able to. I can hear london vts, coastguard and other vhf marine signal but not...
312
harrybriscoe
Mar 2, 2008 2:51 am
... Hi, If it is ShipPlotter you are using, then you have no need of the AISMON software as ShipPlotter is able to decode the messages from the audio signal....
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radioman712000
Mar 3, 2008 9:17 pm
Hi Harry, thanks for your reply. Yes am using shopplotter software.I live in bromley just after catford. I seem to be able to hear the signal but cant decode...
314
harrybriscoe
Mar 5, 2008 12:43 am
Hi Roland, You cannot say which program is better, ShipPlotter or AISMON, since they are not equivalent in terms of what they do. Until AISMON was developed,...
318
Tomek
ndb_krw
Apr 7, 2008 7:32 am
Hi, (this is my first post here) ... Well, actually you can easily compare them in their common part - decoding live audio signal. I have just used Shipplotter...
319
Dave Houy
davehouy
Apr 9, 2008 1:32 am
Tomek, ... That is my experience as well. Your unbiased AISMon author;-) Dave...
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JensNL
Apr 9, 2008 3:40 pm
... AIS comments For the receiver part I agree they are about the same. But you will find out that the packets they receive aren't 100% the same. First if you...
321
Tomek
ndb_krw
Apr 16, 2008 11:53 am
... The packets I compared were really the same since I used both programs at the same time. I agree that for a real comparison I should do more tests. ... For...
322
jepstra22
Apr 28, 2008 7:17 am
Hi, I am "helping a friend with installing nav.software on his sailingship. He bought Wingps wich has a built-in AIS module. The proper/expensive way is to...
323
siirati
Apr 28, 2008 8:15 am
You need a virtual COM port pair. AISMON / WINGPS Ex. com 6 and com 7. AISMON com6 and WINGPS com 7 t T...
326
jackdost
Jun 11, 2008 4:20 pm
Hello, For example we have: !AIVDM,1,1,,A,39NWt<@7kDQGjJ8O;U<;MI<400W0,0*66 How I can check that sentence which I got from the receiver is correct? I am...
327
Dave Houy
davehouy
Jun 11, 2008 4:56 pm
Jacek, AIS uses the CRC-CCITT (0xFFFF) variant, available at http://www.lammertbies.nl/comm/info/crc-calculation.html Dave...
328
Dave Houy
davehouy
Jun 11, 2008 4:59 pm
Jacek, Forgot to mention the CRC is calculated on the undecoded data as transmitted, therefore you'll need to re-encode the ASCII string before calculation. ...
329
Giuseppe Menga
gmenga2007
Jun 11, 2008 5:21 pm
Please Dave, can you detail better what do you means with the last mail? how is the format of the data before the ascii string, and how do you re-decode the...
330
Dave Houy
davehouy
Jun 11, 2008 5:42 pm
Giuseppe, See the AIS specification at: http://www.tdcom.fr/support/index.php?dir=Sailor%2FAIS-1%2FDocuments%2FITU+doc%2F Dave...
331
siirati
Jun 11, 2008 7:42 pm
The checksum is checksum of NMEA sentence. Take a second(A) character from string and XOR with next and next to the '*' character, but not that '*'. Now you...
332
Dave Houy
davehouy
Jun 11, 2008 11:17 pm
Siirati, You are absolutely correct, the CRC16 is used only during verification of the over-the-air packet data. However, a simpler vb calculation of the...
335
Dave Houy
davehouy
Jun 28, 2008 3:57 am
Group, AISMon version 2.1.0 is now available in the files area. The "Use DLL" checkbox has been eliminated, since the .dll is now the only supported option....
336
JensNL
Jul 3, 2008 12:19 am
When I try to run the program I get an error about the TCP/IP ! the text like MSWINSCK.OCX or something depending of is not registered. The old version worked ...
337
jonsiii
Jul 3, 2008 8:09 pm
... http://www.ascentive.com/support/new/support_dll.phtml?dllname=MSWINSCK.OCX I downloaded the missing file from here to windows/system32 and registered it....
338
Dave Houy
davehouy
Jul 3, 2008 10:19 pm
... I've uploaded a new installer that should correctly install MSWINSCK.OCX. Please let me know your results, Dave...
339
lekkas.dimitris
Jul 4, 2008 2:28 pm
Thanks Dave, it works fine now. Anyone interested may try to send data to 195.251.168.18:5351 and see the real-time vessels at...
340
Dave Houy
davehouy
Jul 9, 2008 6:57 pm
Dimitris, I reviewed the new section of the "Cover Your Area" page that refers to AIS Monitor, and noticed that you did not mention the need for a...
341
legonedijk
Jul 11, 2008 3:19 pm
Hallo to you all!!! I am a newby on this forum. Running shipplotter on a vista laptop. Receiver Icom pcr-1500 packet out. Antenna: home brew HB9CV / 162MHz....
342
Dave Houy
davehouy
Jul 14, 2008 1:41 am
Group, AISMon version 2.2.0 is now available in the files area, which contains cosmetic changes and modifications to the installer for Vista compatibility. The...
343
Thormod (Tom) Nordahl
thonord
Jul 29, 2008 11:46 pm
Lets just take one 8bit char "E" E ASCII 69 One approach: 69 - 48 = 21 53 -8 = 13 13 = 001101 Second approach 6 bit ASCII E = 5 5 = 000101 Third approach 69 =...
344
Giuseppe Menga
gmenga2007
Jul 30, 2008 4:30 am
To answer to your question I add the following routine I'm using to decode AIS: int decode(char c) { if (c >= '0' && c <= '9') return((int)c - '0'); if (c ==...
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Thormod (Tom) Nordahl
thonord
Aug 1, 2008 11:45 am
... decode AIS: Thanks Peppe. Not only did you give me the answer, but you did the job as well. Tom...
347
Thormod (Tom) Nordahl
thonord
Aug 17, 2008 9:26 pm
I've been using AIS_Monitor for a couple of weeks and am very happy with it. Thanks for making it avalable. I have come across two things that I wonder about,...
348
JensNL
Aug 18, 2008 5:28 pm
About the first question the missing A, yes there should be a A or a B there, but normaly the plotter will ignore whats in the field, I have seen some puting 1...
