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Re: NMEA output

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  • m_halterman
    Jim, I have been working on a decoder function to no avail. Would you be willing to post the code you came up with to decode the AIS message? Thanks, Mike ...
    Message 1 of 14 , Aug 7, 2006
      Jim, I have been working on a decoder function to no avail. Would
      you be willing to post the code you came up with to decode the AIS
      message?

      Thanks,

      Mike

      --- In aismon@yahoogroups.com, "wallsofjasper2" <jwyman@...> wrote:
      >
      > Dave,
      > Thanks for all the help. That algorithm did the trick... One thing
      > though.. On message type 5 (static ship/voyage data), there are
      > so-called normal 6-bit ascii fields for the call sign. This is a 7
      > character long field. What do I use do convert the 6-bit values
      into a
      > man-readable character. Is their ASCII table for 6-bit values?
      >
      > --- In aismon@yahoogroups.com, Jim Wyman <jwyman@g...> wrote:
      > > Thanks! I will try this tomorrow...
      > >
      > > Dave Houy wrote:
      > >
      > > > Jim,
      > > >
      > > > > Could you provide an example of how you decoded this? for
      example:
      > > > >
      > > > > !AIVDM,1,1,,A,13uTAH002nJRLAHEwTi674rh04:8,0*2B
      > > >
      > > > Firstly, I did not decode this message, I encoded it from the
      decoded
      > > > AIS bitstream.
      > > >
      > > > Put these 28 bytes 13uTAH002nJRLAHEwTi674rh04:8 through the
      provided
      > > > decoding routine, and the accumulated returned 168 (i.e. 28 *
      6) bits
      > > > represent the original AIS message. AIS message formats are
      > documented
      > > > in ITU-R M.1371-1, available at www.itu.int.
      > > >
      > > > Dave
      > > >
      > > >
      > > >
      > > >
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