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Re: how to read AIS data from encapsulated NMEA

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Re: how to read AIS data from encapsulated NMEA VDO sentence
Re: how to read AIS data from encapsulated NMEA
VDO sentence
Source: http://newsgroups.derkeiler.com/Archive/Rec/rec.boats.electronics/2005в€’10/msg00160.html
• From: "Pascal" <pascalg@xxxxxxxxxx>
• Date: 26 Oct 2005 18:30:48 −0700
See this site:
http://www.navicon.dk/web/normal.php?pageid=95
ccorsani@xxxxxxxxx escreveu:
> Hi all, I am a navigation software developer from Italy.
>
> I need to understand how to read AIS data inside the "blob" contained
> in VDO NMEA sentece. I have the ITUв€’R M.1371в€’1 document that should let
> me understand such format. Unfortunately I really cannot understand how
> to read the bits.
>
> Someone, some times ago, posted such message:
>
> >The AIS sentences are in a strange format, encapsulated 6 >bits. One
> >example here:
>
> >'!AIVDO,1,1,,,13:r`R5P1orpG60JeHgRSj4l0000,0*56
> > ' 0 1 2 34 5 6
> > '1 Total number of sentences needed to transfer the message, 1 to 9
> > '2 Message sentence number, 1 to 9
> > '3 Sequential message identifier, 0 to 9
> > '4 AIS channel number
> > '5 Encapsulateled 6в€’bit radio message
> > '6 Number of fillв€’bits, 0 to 5
>>
>>
> > '14eG=ch021rp4FTJdTGRRR0605q4
>>
>>
Re: how to read AIS data from encapsulated NMEA VDO sentence
1
Re: how to read AIS data from encapsulated NMEA VDO sentence
> > 'VDO.Identifier : 1 000001
> > 'Repeat indicator : 0 00
> > 'MMSI : 316001711 >010010110101011100110110101111
> > 'VDO1.NavStatus : 0 0000
> > 'VDO1.ROT : 0 00000000
> > 'VDO1.SOG : 12.9 kns 0010000001
> > 'VDO1.PosAcc : 1 1
> > 'VDO1.Latitude : 46Вє 39.3182'N >1101011100000010001011010010
> > 'VDO1.Longitude : 71Вє 38.2703'W
> >0011010101100100100010111100010100010100
> > 'VDO1.COG : 065Вє 010000000000
> > 'VDO1.Heading : 064Вє 110000000
> > 'VDO1.TimeStamp : 3 sec. 000101
> > 'VDO1.NavStatus : 0 1
> > 'VDO1.CommStatus : 15:17 h 11001000100
>
> I really cannot understand how he found such information inside
> 14eG=ch021rp4FTJdTGRRR0605q4. Please Help
>
> Ciao
> Cristiano
.
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