ZERK(1) GPSD Documentation ZERK(1) (NAME) zerk - GREIS (SYNOPSIS) zerk [OPTIONS] [server[:port[:device]]] zerk -h zerk -V (DESCRIPTION) zerk GREIS ( - GNSS Receiver External Interface Specification) . GPS Javad GREIS . GPS . zerk GPS GREIS . GREIS Guide . zerk GREIS GPS GPS GPS . GREIS gpsd ( ) . zerk (root) . sudo . (OPTIONS) : -?, -h zerk . -c COMMAND GPS. COMMAND ( GPS ) . . -d OPTION GPS. OPTION ( ) . zerk GPS -W . 4HZ GREIS 4Hz. : [RT] [UO] [GT] [PV] [SG] [DP] [SI] [EL] [AZ] [EC] [SS] [ET] COMPASS COMPASS (BeiDou). CONS . DEFMSG (/dev/msg) 1Hz. GALILEO GALILEO. GLONASS GLONASS. GPS GPS. IPR (Integer Pseudo Range). : [rx] [rc] [r1] [r2] [r3] [r5] [rl]. IRNSS IRNSS. NMEA NMEA 4.1e 4Hz. GBS GGA GSA GST GSV RMC VTG ZDA . QZSS QZSS. SBAS SBAS. SNR (SNR) [EC]. : [E1] [E2] [E3] [E5] [El]. -e OPTION GPS. OPTION ( ) . zerk GPS -W . -e OPTION -d . -f FILE . FILE ( ) . . / -r . pyserial . -O OAF (OAF Option Authorization File) GPS. OAF ( ) . OAF '.jpo' ( GREIS) . -O .jpo GPS . -p PRESET GPS. PRESET ( ) . zerk GPS -W . COLDBOOT (Coldboot) GPS. CONS . DM GREIS. ID (ID) . IPR . : [rx] [rc] [r1] [r2] [r3] [r5] [rl]. OAF OAF. RESET (Reboot) GPS. SERIAL . SNR (SNR): [EC] [E1] [E2] [E3] [E5] [El]. VENDOR GPS. VER GPS. -r . GPS . -R RAW GPS RAW. -S SPEED GPS SPEED (bps). -s SPEED SPEED (bps). 115,200 . -V zerk . -v VERBOSITY VERBOSITY. 0 ( ) 4 ( ) . 2 . -W . -d -e -p. -w WAIT WAIT . -d -e -p -W . 2.0 . (ARGUMENTS) gpsd localhost GPSD 2947 . : [server[:port[:device]]] ARGUMENTS gps(1) . (ENVIRONMENT) ZERKOPTS . . (EXAMPLES) GPS gpsd : zerk -c "print,/cur/term" : zerk -r -f greis-binary.log -v 2 GPS /dev/ttyAMA0 230,400 : zerk -S 230400 -f /dev/ttyAMA0 (Reset) GPS: zerk -p RESET -v 2 -w 20 -W (SVs): zerk -W -w 2 -v 2 -c "out,,jps/{CS,ES,GS,Is,WS,QS}" gpsd : zerk -v 2 -w 5 server (RETURN VALUES) 0 . 1 (SEE ALSO) zerk Javad GREIS . GREIS Guide . gpsd(8) (RESOURCES) : (COPYING) GPSD (Copyright 2013 by the GPSD project) SPDX-License-Identifier: BSD-2-clause (AUTHORS) Gary E. Miller GPSD, Version 3.27.5 2025-11-04 ZERK(1)