GPSPROF(1) GPSD Documentation GPSPROF(1) (NAME) gpsprof - GPS gpsd (SYNOPSIS) gpsprof [OPTIONS] [server[:port[:device]]] gpsprof -h gpsprof -V (DESCRIPTION) gpsprof (skyview) (time drift) GPS . GNUPLOT . . GPS . gpsprof (instrumentation) gpsd . gpsd (logfile) . gpsprof . gpsprof . gnuplot(1) . gpsprof (root) . (OPTIONS) -f, --formatter . : space (scatterplot) (fixes) . GPS gpsprof . . . polar (heat map) (SNR) . GPS . SNR . (azimuth) (elevation) . . () . GPS . polarunused polar . GPS . polarused polar . . time () ( NTP) GPS PPS. (X) . (Y) GPS . instrumented . GPS . << >> SORC ( start-of-reporting-cycle) . . 9600bps . EORC << >> ( end-of-reporting-cycle) . : Fix latency ( ) () GPS SORC. RS232 time ( RS232) RS232 ( ). Analysis time ( ) EORC SORC RS232. / (I/O) . Reception time ( ) gpsprof . RS232 . -m ( ) . uninstrumented . . X . Y . . -?, -h, --help . -d FILE, --dumpfile FILE gnuplot(1) . -d LVL, --debug LVL (debug). -l FILE, --logfile FILE JSON FILE . -n SEC, --wait SEC . . GPS (fix) . -r, --redo JSON ( -l, logfile) . -n, --wait -l, --logfile . -S STR, --subtitle STR . . -t STR, --title STR . . -T TERM, --terminal TERM (terminal) gnuplot(1) . "-T png" "-T pngcairo" gnuplot(1) PNG . "x11" . gnuplot(1) . . "-T png" PNG . "-T jpeg" JPEG . "-T pngcairo" . . gnuplot(1) : gnuplot -e "set terminal" (ARGUMENTS) gpsd localhost GPSD 2947 . : [server[:port[:device]]] ARGUMENTS gps(1) . (SIGNALS) SIGUSR1 . (process ID) . (EXAMPLES) gnuplot(1) . x11 : gpsprof | gnuplot -p : gpsprof -T png | gnuplot > image.png GPS : gpsprof -f polar -T jpeg -l polar.json | gnuplot > polar.png PNG polarused polarunused GPS : gpsprof -f polarused -T jpeg -r < polar.json > polarused.plot gnuplot < polarused.plot > polarused.png gpsprof -f polarunused -T jpeg -r < polar.json > polarunused.plot gnuplot < polarunused.plot > polarunused.png . . : gpspipe -w -x 3600 ::/dev/ttyS0 > MY.raw gpsdecode < MY.raw > MY.json gpsprof -r -T pngcairo -t "MY Title" < MY.json > MY.plt gnuplot MY.plt > MY.png display MY.png gpspipe gpsd /dev/ttyS0 MY.raw . . gpsdecode MY.raw JSON gpsd MY.json . gpsprof MY.json gnuplot MY.plt . gnuplot MY.plt MY.png . display MY.png ..SH " (RETURN VALUES)" 0 . 1 . (SEE ALSO) gpsd(8), display(1), gnuplot(1), gpsctl(1), gps(1), libgps(3), libgpsmm(3), gpsprof(1), gpsfake(1). (RESOURCES) : (COPYING) 2013 GPSD SPDX-License-Identifier: BSD-2-clause (AUTHOR) Eric S. Raymond GPSD, Version 3.27.5 2025-12-11 GPSPROF(1)