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gps2udp - Man Page

feed the take from gpsd to one or more aggregation sites


gps2udp [Options] [server[:port[:device]]]

gps2udp -h

gps2udp -V


gps2udp is a tool to connect to gpsd and output the received sentences to one or many UDP host:port destinations. This makes the program useful for feeding AIS information from gpsd to aishub, marinetraffic, shipfinder,...

gps2udp does not require root privileges, but can run as root.  It can be run concurrently with other tools connecting to the local gpsd without causing problems.

The output will consist of one or both of NMEA (-n option) or JSON (-j option) gpsd sentences. The output is sent to one or many destinations host through a UDP network socket (-u HOST:PORT options) .

Optionally a server, TCP/IP port number and remote device can be given. If omitted, gps2udp connects to localhost on the default port (2947) and watches all devices opened by gpsd.

gps2udp may be run as a daemon (-b option).

gps2udp is designed to run smoothly in background; it reconnects automatically to gpsd whenever it is restarted. For debugging purporses, there is an option to exit gracefully after a given count of packets (-c option).


-?,  -h,  --help

-Print a usage message and exit.

-a,  --ais

Send only AIS messages.

-b,  --daemon

Causes gps2udp to run as a daemon.

-c COUNT, --count COUNT

Exit after COUNT sentences are sent.

-d LVL, --debug LVL

Set debug level to LVL. LVL = 0 prints nothing. LVL = 1 prints sent packet on stdout. LVL = 2 prints ignored packets.

-j,  --json

Causes JSON sentences to be output.

-n,  --nmea

Causes NMEA sentences to be output.

-t,  --tpv

Only output TPV sentences. Implies --json.


UDP destination for output sentenses (up to five destinations).

-v,  -V,  --version

Prints the program version, then exit. -v is deprecated December 2020.


By default, clients collect data from the local gpsd daemon running on localhost, using the default GPSD port 2947. The optional argument to any client may override this behavior: [server[:port[:device]]]

For further explanation, and examples, see the ARGUMENTS section in the gps(1) man page


With a running gpsd accessible on the network this will collect data from localhost:gpsd display them on stdout and send a copy to test aishub in NMEA format.

gps2udp -d 1 -n -u data.aishub.net:2222

This will collect data from a remote gpsd located on fridu.net host, will filter AIS messages and send them to 3 destinations (aishub, marinetraffic, shipfinder) in NMEA format, while running in background mode

gps2udp -a -n -b -u data.aishub.net:2222 -u \
   -u fridu.net:2947

Return Values


on success.


on failure

See Also

gpsd(8), gps(1)


Project web site: https://gpsd.io/


This file is Copyright 2013 by the GPSD project
SPDX-License-Identifier: BSD-2-clause


Fulup Ar Foll


2023-01-10 GPSD Version 3.25 GPSD Documentation