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| author | Eric S. Raymond <esr@thyrsus.com> | 2011-05-07 10:37:56 -0400 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2011-05-07 10:37:56 -0400 |
| commit | 16a2b32f79b56debefbb855d9129a553a6a1fe2f (patch) | |
| tree | 80167e64e827e6de8429d9483214cd5a20dd3aa4 /www | |
| parent | 1651fb0ea674fd3d9cd580a0e06d08e47f7007cb (diff) | |
| download | gpsd-16a2b32f79b56debefbb855d9129a553a6a1fe2f.tar.gz | |
In AIS, another sensor report type.
Diffstat (limited to 'www')
| -rw-r--r-- | www/AIVDM.txt | 56 |
1 files changed, 54 insertions, 2 deletions
diff --git a/www/AIVDM.txt b/www/AIVDM.txt index 12fc0c91..cde6c473 100644 --- a/www/AIVDM.txt +++ b/www/AIVDM.txt @@ -2526,7 +2526,7 @@ Here are the payload types for each variant: |63-67 | 5 |Hour (UTC) |hour |u|0-23; 24 = N/A (default) |68-73 | 6 |Minute (UTC) |minute |u|0-59; 60 = N/A (default) |74-81 | 8 |Duration |duration |u|Forecast duration in minutes, - 262143 = N/A (default), + 255 = N/A (default), 0 = cancel forecast. |82-84 | 3 |Spare | |x|Not used |============================================================================== @@ -2549,7 +2549,59 @@ The timestamp group is intended as a valid time of forecast. .Water level report payload [frame="topbot",options="header"] |============================================================================== -|Field |Len |Description |Member |T|Units +|0-0 | 1 |Water Level Type |absolute |b|False if relative to + reference datum. +|1-16 | 16 |Water Level |level |i|In 0.001 meter steps, + -327.67 to 327.67, + -32767 = -327.67m or less, + 32767 = 327.67m or more, + -32768 = N/A (default). +|17-18 | 2 |Water Level Trend |leveltrend |u| 0 = increasing, + 1 = decreasing, + 2 = steady, + 3 = N/A (default). +|19-23 | 5 |Vertical Reference Datum |datum |u|See table below +|24-26 | 3 |Sensor Description |sensortype |u|See Sensor Types table +|27-27 | 1 |Forecast Water Level Type|absolute |b|False if relative to + reference datum. +|28-43 | 16 |Forecast Water Level |level |i|In 0.001 meter steps, + -327.67 to 327.67, + -32767 = -327.67m or less, + 32767 = 327.67m or more, + -32768 = N/A (default). +|44-48 | 5 |Day (UTC) |day |u|1-31; 0 = N/A (default) +|49-53 | 5 |Hour (UTC) |hour |u|0-23; 24 = N/A (default) +|54-59 | 6 |Minute (UTC) |minute |u|0-59; 60 = N/A (default) +|60-67 | 8 |Duration |duration |u|Forecast duration in minutes, + 255 = N/A (default), + 0 = cancel forecast. +|68-84 | 17 |Spare | |x|Not used +|============================================================================== + +IMO289 says water level is in 0.1m steps, but this is incompatible with the +two digits of precision in the range. + +The timestamp group is intended as a valid time of forecast. + +.Vertical Reference Datum +[frame="topbot",options="header"] +|============================================================================== +| 0 | Mean Lower Low Water (MLLW) +| 1 | International Great Lakes Datum (IGLD-85) +| 2 | Local river datum +| 3 | Station Datum (STND) +| 4 | Mean Higher High Water (MHHW) +| 5 | Mean High Water (MHW) +| 6 | Mean Sea Level (MSL) +| 7 | Mean Low Water (MLW) +| 8 | National Geodetic Vertical Datum (NGVD-29) +| 9 | North American Vertical Datum (NAVD-88) +| 10 | World Geodetic System (WGS-84) +| 11 | Lowest Astronomical Tide (LAT) +| 12 | pool +| 13 | gauge +| 14 | Unknown/not available (default) +| 15-30| Reserved for future use |============================================================================== .Current flow (2D) report payload |