diff options
| -rw-r--r-- | share/man/man4/nmea.4 | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/share/man/man4/nmea.4 b/share/man/man4/nmea.4 index 98627f13c73..4f5745881d3 100644 --- a/share/man/man4/nmea.4 +++ b/share/man/man4/nmea.4 @@ -1,4 +1,4 @@ -.\" $OpenBSD: nmea.4,v 1.25 2015/01/15 00:48:10 deraadt Exp $ +.\" $OpenBSD: nmea.4,v 1.26 2018/09/02 08:14:25 landry Exp $ .\" .\" Copyright (c) 2006, 2007 Marc Balmer <mbalmer@openbsd.org> .\" @@ -14,7 +14,7 @@ .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" -.Dd $Mdocdate: January 15 2015 $ +.Dd $Mdocdate: September 2 2018 $ .Dt NMEA 4 .Os .Sh NAME @@ -41,21 +41,34 @@ information and the local time), and position (calculated latitude and longitude in degrees) can be accessed through the .Xr sysctl 8 interface. -.Sh NMEA SENTENCES +.Pp The .Nm -line discipline decodes the following NMEA 0183 sentences: -.Bl -tag -width "GPRMCXX" -.It GPRMC -Recommended Minimum Specific GPS/TRANSIT Data. +line discipline decodes NMEA 0183 +Recommended Minimum Specific GPS/TRANSIT Data sentences. The time and date information and position are extracted. The warning indication is used to provide the sensor status (see below). -If the attached device sends the GPRMC message in the 13-field format, +If the attached device sends the RMC message in the 13-field format, the operation mode of the GPS device is reported in the sensor description. The sensor timestamp is copied from the tty timestamp if a device with PPS is being used and tty timestamping has been turned on. Otherwise the sensor timestamp is taken when the initial `$' character of a message block is received from the NMEA device. +.Pp +RMC messages source are recognised by the first two characters of the +sentence according to the following prefixes: +.Pp +.Bl -tag -width "XXXXX" -offset indent -compact +.It GP +GPS +.It GA +Galileo +.It BD +BeiDou +.It GL +Glonass +.It GN +Generic GNSS .El .Sh SENSOR STATES The quality of the timedelta is reported as the sensor status: |