12-11-2019
These are GPS clocks, some kind of harware device. Not sure if those are GNSS, it is maintained by some other team. But I can get more information about it.
So far, I didn't notice any issue on any server or our internal devices, neither any app or DB team reported.
Those messages, stated in my first post are from /var/adm/messages. It is monitoring team, who has set up to create a ticket based on these kinds of alerts. So it is little noise from management, why synchronization is lost to GPS devices and why time is drifted back around 1 second. I am just trying to find these answers.
Another thing I noticed is, poll says 1024. That means 1024 seconds without guidance means slow sync, slow adjustments etc. Am I understanding it correctly? If yes, should "minpoll 4 maxpoll 8" entry in ntp.conf for all 3 GPS devices help?
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LEARN ABOUT DEBIAN
gpscorrelate
GPSCORRELATE(1) [FIXME: manual] GPSCORRELATE(1)
NAME
gpscorrelate - correlates digital images with GPS data filling EXIF fields
SYNOPSIS
gpscorrelate [-z | --timeadd +/-HH[:MM]] [-O | --photooffset seconds] [-i | --no-interpolation] [-v | --verbose] [-d | --datum datum] [-n |
--no-write] [-m | --max-dist time] [-t | --ignore-tracksegs] [-M | --no-mtime] [-f | --fix-timestamps] [-p | --degmins]
-g file.gpx image.jpg...
gpscorrelate -s | --show | -o | --machine image.jpg...
gpscorrelate [-M | --no-mtime] {-r | --remove} image.jpg...
gpscorrelate -V | --version | -h | --help
gpscorrelate-gui
DESCRIPTION
This manual page documents briefly the gpscorrelate and gpscorrelate-gui commands.
There is an extended documenation available in HTML format; see below.
gpscorrelate is a program that acts on digital images in JPEG format filling EXIF (Exchangeable Image File Format) fields related to GPS
(Global Positioning System) information. Source for the GPS data is a record of GPS information encoded in GPX (GPS Exchange Format)
Format. The act of filling those fields is referred to as correlation.
If GPS data are available at the precise moment the image was taken (with a 1-second granularity) the GPS data are stored unmodified in
EXIF fields. If they are not linear interpolation of GPS data available at moments before and after the image was taken can be used.
gpscorrelate is a command line tool implementing correlation whereas gpscorrelate-gui is the corresponding GTK+ graphical user interface.
OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included
below. For a complete description, see the HTML documentation.
-g, --gps file.gpx
correlate using the specified GPX file with GPS data
-s, --show
only show the GPS data of the given images
-o, --machine
only show the GPS data of the given images in a machine readable output, if there is any
-r, --remove
only remove GPS EXIF data from the given images
-z, --timeadd +/-XX[:XX]
time to add to GPS data to make it match the timestamps of the images. GPS data is in UTC; images are not likely to be in UTC. Enter
the timezone used when taking the images: eg, +8 for Perth
-O, --photooffset seconds
time in seconds to add to the photo timestamp to make it match the GPS timestamp. To determine the amount of seconds needed, just
create a picture of your GPS device showing the current time and compare it with the timestamp of your photo file.
-i, --no-interpolation
disable interpolation between points. Interpolation is linear, points are rounded if disabled
-v, --verbose
show which GPS data has been selected for each image
-d, --datum datum
specify measurement datum. If not set, WGS-84 used
-n, --no-write
do not write the exif data. Useful with --verbose
-m, --max-dist time
max time outside points that image will be matched. Time is in seconds
-t, --ignore-tracksegs
Interpolate between track segments, too
-M, --no-mtime
Do not change mtime of modified files
-f, --fix-timestamps
Fix broken GPS datestamps written with versions < 1.5.2
-p, --degmins
Write location as DD MM.MM as was default before < 1.5.3
-h, --help
Only show summary of options
-V, --version
Only print the version
SEE ALSO
gpsd (1), gpsbabel (1), gpxlogger (1), cgpxlogger (1).
The documentation of gpscorrelate and gpscorrelate-gui in HTML format are available on the filesystem at /usr/share/doc/gpscorrelate.
AUTHOR
This manual page was initially written by Stefano Zacchiroli zack@debian.org for the Debian(TM) system. It was extended by Till Maas
opensource@till.name. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public
License, Version 2 any later version published by the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.
AUTHOR
Stefano Zacchiroli
Author.
COPYRIGHT
Copyright (C) 2006, 2008 Stefano Zacchiroli zack@debian.org, Till Maas
[FIXME: source] 30 Oct 2008 GPSCORRELATE(1)