Net::GPSD3::Return::TPV(3pm)				User Contributed Perl Documentation			      Net::GPSD3::Return::TPV(3pm)

NAME

       Net::GPSD3::Return::TPV - Net::GPSD3 Return TPV Object

SYNOPSIS

	 printf "Time: %s, Lat: %s, Lon: %s
", $object->time, $object->lat, $object->lon;

DESCRIPTION

       Provides a Perl object interface to the Time-Velocity-Position (TVP) object returned by the GPSD daemon.

       Example JSON objects:

       Protocol 3.1 Versions

	 {
	   "class":"TPV",
	   "tag":"MID2",
	   "device":"/dev/ttyUSB0",
	   "time":1253593085.470,
	   "ept":0.005,
	   "lat":38.88945123,
	   "lon":-77.03522143,
	   "track":171.7249,
	   "speed":0.467,
	   "mode":2
	 }

	 {
	   "class":"TPV",
	   "tag":"MID2",
	   "device":"/dev/ttyUSB0",
	   "time":1253593667.430,
	   "ept":0.005,
	   "lat":38.88945123,
	   "lon":-77.03522143,
	   "alt":146.911,
	   "track":180.0000,
	   "speed":0.194,
	   "climb":-0.157,
	   "mode":3
	 }

       Protocol 3.4 Version

	 {
	   "class":"TPV",
	   "tag":"0x0106",
	   "device":"/dev/cuaU0",
	   "time":"2011-03-20T06:51:59.12Z",
	   "ept":0.005,
	   "lat":37.371427205,
	   "lon":-122.015179890,
	   "alt":25.789,
	   "epx":1.926,
	   "epy":1.808,
	   "epv":6.497,
	   "track":0.0000,
	   "speed":0.000,
	   "climb":0.000,
	   "eps":3.85,
	   "mode":3
	 }

METHODS PROPERTIES

   class
       Returns the object class

   string
       Returns the JSON string

   parent
       Return the parent Net::GPSD object

   device
       Name of originating device.

   tag
       Type tag associated with this GPS sentence; from an NMEA device this is just the NMEA sentence type.

   mode
       NMEA mode: %d, 0=no mode value yet seen, 1=no fix, 2=2D, 3=3D.

   time
       Seconds since the Unix epoch, UTC.  The value may have a fractional part of up to .01sec precision.

       Note: In 2.96 (protocol 3.4) the TPV->time format changed from unix epoch to W3C, but this method hides that from the user.

   timestamp
       W3C formated timestamp value either directly from the protocol >= 3.4 or calculated < 3.4.  The value may have a fractional part of up to
       .01sec precision.

       Note: I expect that in protocol 3.5 the value will be passed directly as TPV->timestamp

   datetime
       Returns a DateTime object

   lat
       Latitude in degrees: +/- signifies West/East

   lon
       Longitude in degrees: +/- signifies North/South.

   alt
       Altitude in meters.

   speed
       Speed over ground, meters per second.

   track
       Course over ground, degrees from true north.

   climb
       Climb (postive) or sink (negative) rate, meters per second.

   ept
       Estimated timestamp error (%f, seconds, 95% confidence).

   epx
   epy
       Latitude error estimate in meters, 95% confidence.

   epv
       Estimated vertical error in meters, 95% confidence.

   eps
       Speed error estimate in meters/sec, 95% confifdence.

   epd
       Direction error estinmate in degrees, 95% confifdence.

   epc
       Climb/sink error estinmate in meters/sec, 95% confifdence.

METHODS VALUE ADDED

   point
       Returns a GPS::Point Object

BUGS

       Log on RT and Send to gpsd-dev email list

SUPPORT

       DavisNetworks.com supports all Perl applications including this package.

       Try gpsd-dev email list

AUTHOR

	 Michael R. Davis
	 CPAN ID: MRDVT
	 STOP, LLC
	 domain=>michaelrdavis,tld=>com,account=>perl
	 http://www.stopllc.com/

COPYRIGHT

       This program is free software licensed under the...

	 The BSD License

       The full text of the license can be found in the LICENSE file included with this module.

SEE ALSO

       Net::GPSD3, GPS::Point, Net::GPSD3::Return::Unknown

perl v5.14.2							    2011-11-09					      Net::GPSD3::Return::TPV(3pm)