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author | Eric S. Raymond <esr@thyrsus.com> | 2009-03-17 20:54:34 +0000 |
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committer | Eric S. Raymond <esr@thyrsus.com> | 2009-03-17 20:54:34 +0000 |
commit | 95886b43909f6793d23702b4ff6e2e211a0d9ac0 (patch) | |
tree | 7b58da7ed4d2c7565f50cfcae37220ba5eeff631 /gpsdecode.xml | |
parent | d7a342483b7c076809ed041dd5816f73f6ab4ad7 (diff) | |
download | gpsd-95886b43909f6793d23702b4ff6e2e211a0d9ac0.tar.gz |
Parse, and describe, the RAIM bit.
Diffstat (limited to 'gpsdecode.xml')
-rw-r--r-- | gpsdecode.xml | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/gpsdecode.xml b/gpsdecode.xml index 739ca207..7a93fdcf 100644 --- a/gpsdecode.xml +++ b/gpsdecode.xml @@ -50,24 +50,24 @@ used by the marine Automatic Identification System. This can be decoded, but not yet encoded.</para> <para> The dump lines are values of AIS payload fields, -comma-separated, in the order that they occur in the payload, There -are two exceptions: spans of fields expressing a date are emitted as -an ISO8601 timestamp (look for colons and the trailing Z indicating -Zulu/UTC time), and the 19-bit group of TDMA status fields found at -the end of message types 1-4 are are dumped as a single unsigned -integer in hex. (Unused regional-authority fields are also dumped in -hex.)</para> +comma-separated, in the order that they occur in the payload, spare +and assigned-mode bits omitted. Spans of fields expressing a date are +emitted as an ISO8601 timestamp (look for colons and the trailing Z +indicating Zulu/UTC time), and the 19-bit group of TDMA status fields +found at the end of message types 1-4 are are dumped as a single +unsigned integer in hex. (Unused regional-authority fields are also +dumped in hex.)</para> <para>By default, certain scaling and conversion operations are performed for the output. Latitudes and longitudes are scaled to decimal degrees rather than the native AIS unit of 1/10000th of a -minute of arc. Ship (but not air) speeds are scaled to knots rather than tenth-of-knot -unit. Navigation status and positioning-system type are dumped -as text strings rather than IAS numeric codes. Rate of turn -may appear as "nan" if is unavailable, of as one of the strings +minute of arc. Ship (but not air) speeds are scaled to knots rather +than tenth-of-knot unit. Navigation status and positioning-system +type are dumped as text strings rather than IAS numeric codes. Rate of +turn may appear as "nan" if is unavailable, of as one of the strings "fastright" or "fastleft" if it is out of the IAS encoding range; -otherwise it is quadratically mapped back to the turn sensor number -in degrees per minute. Vessel draughts are conveted to decimal meters +otherwise it is quadratically mapped back to the turn sensor number in +degrees per minute. Vessel draughts are conveted to decimal meters rather than native AIS decimeters.</para> </refsect1> |