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| author | Eric S. Raymond <esr@thyrsus.com> | 2011-05-26 08:23:21 -0400 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2011-05-26 08:23:21 -0400 |
| commit | ca9f363c457b42372fc10c2883535035bcd7a1fe (patch) | |
| tree | 81a736d8ea349fbdfcddb575b042251f2f9a8523 /www | |
| parent | 0538ad7f04e56ff9417fb2fef2ede3f421004ca2 (diff) | |
| download | gpsd-ca9f363c457b42372fc10c2883535035bcd7a1fe.tar.gz | |
Add array boundary markers to the AIS message layout descruiptions.
Diffstat (limited to 'www')
| -rw-r--r-- | www/AIVDM.txt | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/www/AIVDM.txt b/www/AIVDM.txt index 543df12d..c2b1c080 100644 --- a/www/AIVDM.txt +++ b/www/AIVDM.txt @@ -487,6 +487,7 @@ type descriptions. |x| Spare or reserved bit |t| String (packed six-bit ASCII) |d| Data (uninterpreted binary) +|a| Array boundary. Following fields are repeated to end of message |============================================================================== The field breakdowns in this document have been checked against live @@ -960,6 +961,7 @@ different widths for the latitude, longitude, and current-speed fields |82-87 | 6 |FID |fid |u|FID = 14 |88-91 | 4 |Month |month |u|1-12; 0 = N/A (default) |92-96 | 5 |Day |day |u|1-31; 0 = N/A (default) +| | | | |a|Tidal information |97-123 | 27 |Latitude |lat |I4|Unit = minutes * 0.0001, 91000 = N/A (default), N positive, S negative. @@ -1595,6 +1597,7 @@ A message 6 subtype. DAC = 001 FID = 28. Variable length: 204-1029 bits. 262,143 = N/A (default), |144-148 | 5 | |waycount |u|Waypoint count (1-16), Values 17-31 are not used. +| | | | |a|Waypoint array |149-176 | 28 |Longitude |lon |I4|Minutes * 0.0001, 181000 = N/A (default), E positive, W negative. @@ -1673,6 +1676,7 @@ different bit widths for the latitude and longitude fields. |82-87 | 6 |FID |fid |u|FID = 32 |88-91 | 4 |Month |month |u|1-12; 0 = N/A (default) |92-96 | 5 |Day |day |u|1-31; 0 = N/A (default) +| | | | |a|Tidal information |97-121 | 25 |Longitude |lon |I3|Unit = minutes * 0.001, 181000 = N/A (default), E positive, W negative. @@ -2905,7 +2909,7 @@ distance measured from the surface of the water to the sensor. The timestamp is for the forecast air gap. -==== Route Information (broadcast) ==== +==== IMO289 Route Information (broadcast) ==== The content of this message is a time and a list of waypoints describing a course. It has an addressed equivalent that is a message 6 subtype. @@ -2934,6 +2938,7 @@ A message 8 subtype. DAC = 001 FID = 27. Variable length: 172-997 bits. 262,143 = not available (default). |112-116 | 5 | |waycount |u|Waypoint count (1-16,) Values 17-31 are not used. +| | | |a|Waypoint array |117-144 | 28 |Longitude |lon |I4|Unit = minutes * 0.0001, 181000 = N/A (default), E positive, W negative. @@ -2948,7 +2953,7 @@ end with 1 to 16 waypoints. For interpretation of the Route Type field, see the table under the "Route Information (addressed)" message (DAC=1, FID=28). -==== Text description (broadcast) ==== +==== IMO289 Text description (broadcast) ==== A message 8 subtype. DAC = 001 FID = 29. Variable length: 72-1032 bits. |