I've got a couple of ARM SBCs without proper RTC but with USB GPS receivers that set the clock without network. After a small amount of fussing, it seems I can get gpsd and chrony to steer the clock to within a few milliseconds of NTP time. Plus or minus 10ms is good enough for my application.
The first few pages of google didn't turn up the pinout for the GPS module; perhaps you could get out an oscilloscope and see if the PPS line is connected? I did find one document ( https://www.farnell.com/datasheets/28007.pdf) suggesting that the TIMEMARK signal is optional, so they may not have even connected it. https://chrony-project.org/faq.html#_how_should_chronyd_be_configured_with_gpsd https://austinsnerdythings.com/2021/09/29/millisecond-accurate-chrony-ntp-with-a-usb-gps-for-12-usd/ On Fri, Oct 31, 2025 at 4:37 PM Stuart Blake Tener <[email protected]> wrote: > GPSD users, developers, et alia: > > I have a General Dynamics GD8200 laptop that is inclusive of an internal > GPS receiver. I was able to get GPSD running and cgps does show the > satellites it sees, etc... However, I am a bit lost as to how to ascertain > if I have pps capability and how to configure the software such that I can > access it for setting the time on my laptop. > > However, if indeed the GPS internal to my laptop does not have PPS > capability, I am wondering if and how I can use the time within the GPS > strings to set the clock in the laptop as well. I realize it is less > accurate, but I am not doing anything transactional with the laptop so if > it is 10 to 20 seconds behind every day I really not that concerned about > it. > > I am not sure if I am still a member of the list (I do not get daily or > weekly emails) but I may have just disabled receiving them in the past. > > Thanks in advance to everyone on the list for any guidance that may help > me. > > > Very Respectfully, > > Stuart Blake Tener, BScCS, N3GWG (Extra), MROP > Computer Scientist / FCC Licensed Radio Operator > > Las Vegas, NV / Philadelphia, PA > > +(1) 310.358.0202 Mobile Phone / WhatsApp > +(1) 215.338.6005 Google Voice > > Amateur Radio IDs: DMR: 3132252[nn], 3132499 and NXDN ID: 6627 > -- GDB has a 'break' feature; why doesn't it have 'fix' too?
