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| author | Eric S. Raymond <esr@thyrsus.com> | 2013-10-14 07:10:57 -0400 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2013-10-14 07:10:57 -0400 |
| commit | 0e045976280cc26a28a427ab7b37b2a30a2684fa (patch) | |
| tree | 0b05ec51ac1e8e0e2e6a52d5a04252fad9be2f90 /www/AIVDM.txt | |
| parent | 667590bf75a191388366264874fe55a4f1029cda (diff) | |
| download | gpsd-0e045976280cc26a28a427ab7b37b2a30a2684fa.tar.gz | |
Add a note about misformatted Type 5s.
Diffstat (limited to 'www/AIVDM.txt')
| -rw-r--r-- | www/AIVDM.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/www/AIVDM.txt b/www/AIVDM.txt index 241a05b2..9459888b 100644 --- a/www/AIVDM.txt +++ b/www/AIVDM.txt @@ -728,6 +728,11 @@ In practice, the information in these fields (especially ETA and destination) is not reliable, as it has to be hand-updated by humans rather than gathered automatically from sensors. +Also note that it is fairly common in the wild for this message to +have a wrong bit length (420 or 422). Robust decoders should ignore +trailing garbage and deal gracefully with a slightly truncated +destination field. + //: Type 5 [frame="topbot",options="header"] |============================================================================== |