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  • J
    jimp Rebel Alliance Developer Netgate
    last edited by Nov 28, 2012, 3:35 PM

    Also if you want to provide a highly accurate clock to your own users so that you don't need to rely solely on external time sources.

    I'd say for more realtime applications like stock trading but IIRC USB is too slow/inaccurate for extremely high precision (e.g. PPS) to work properly. You'd need a "real" serial GPS unit for that.

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    • A
      apmuthu
      last edited by Nov 29, 2012, 2:18 PM

      Are there any 2.0.2 snapshots. I've only seen the v2.1 snapshots.

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      • J
        jimp Rebel Alliance Developer Netgate
        last edited by Nov 29, 2012, 2:25 PM

        http://files.nyi.pfsense.org/jimp/foo/shiny/ehrmagerd/

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        • J
          johnpoz LAYER 8 Global Moderator
          last edited by Nov 29, 2012, 10:30 PM

          @jimp what device are you using?  Cost of?  I would love to do something like this.

          An intelligent man is sometimes forced to be drunk to spend time with his fools
          If you get confused: Listen to the Music Play
          Please don't Chat/PM me for help, unless mod related
          SG-4860 24.11 | Lab VMs 2.7.2, 24.11

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          • J
            jimp Rebel Alliance Developer Netgate
            last edited by Nov 29, 2012, 11:19 PM

            I forget the exact model, it was provided to me so I don't know the cost. It was going to be sold just for this type of deployment, but the quality of the devices wasn't quite what we'd hoped.

            It still works passably for this for me, not sure how accurate it is in the long run though.

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            • S
              stephenw10 Netgate Administrator
              last edited by Nov 29, 2012, 11:24 PM

              You tweeted it much earlier Jim:

              @JimP:

              Navisys GR-601W USB GPS plugged into an ALIX. Nothing too fancy.

              The problem with that particular device is that it doesn't seem to be available individually to the consumer.

              Steve

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              • J
                jimp Rebel Alliance Developer Netgate
                last edited by Nov 29, 2012, 11:34 PM

                Aha, go figure twitter has a longer memory than me. ;-)

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                • J
                  johnpoz LAYER 8 Global Moderator
                  last edited by Nov 29, 2012, 11:50 PM

                  Does anyone have suggestion of a device?  I found this thread about that model

                  http://blog.gmane.org/gmane.comp.hardware.gps.thumbgps

                  Seems you can buy them in bulk 100 units ;)

                  An intelligent man is sometimes forced to be drunk to spend time with his fools
                  If you get confused: Listen to the Music Play
                  Please don't Chat/PM me for help, unless mod related
                  SG-4860 24.11 | Lab VMs 2.7.2, 24.11

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                  • S
                    stoffix
                    last edited by Mar 3, 2013, 11:03 PM

                    @jimp:

                    I've got a USB serial GPS that it works with, though the unit is of slightly questionable quality as it seems to lock on to a GPS point about 25 miles away from where I actually am.

                    Anyhow, as it says on the page, anything that outputs the right signal (NMEA format output) on a serial port that the firewall can use is OK.

                    The GPS unit is probably just fine.
                    The gps outputs the position in dd.mmmm (degrees,minutes(decimal minutes)). (ref. http://www.teletype.com/pages/support/Documentation/RMC_log_info.htm)
                    This data is sent to google maps, which expects the data in dd.dddd format. (degrees, decimal degrees.)

                    You can use this calculator to convert the coordinate format: http://www.gpscoordinates.eu/convert-gps-coordinates.php

                    If you try, you should see that your gps actually works properly ;)

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                    • J
                      jimp Rebel Alliance Developer Netgate
                      last edited by Mar 4, 2013, 12:59 AM

                      Yep, you're right. I could swear I accounted for that in the code or used a special syntax in the google maps URL but I went back and checked again, and it didn't do the extra conversion.

                      Fixed now.. https://github.com/bsdperimeter/pfsense/commit/96a7ddb7604b4f422e2fdff3078e80109efed4dd

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                      • A
                        apmuthu
                        last edited by Jul 2, 2013, 3:13 AM

                        The new link for the fix is at:
                        https://github.com/pfsense/pfsense/commit/96a7ddb7604b4f422e2fdff3078e80109efed4dd

                        Also the new patches are at:
                        http://files.nyi.pfsense.org/

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                        • B
                          biggsy
                          last edited by Jul 2, 2013, 11:23 AM

                          This was fun to build and configure.  Not as challenging as it could have been, though, if someone hadn't already compiled an image for the Pi: http://ntpi.openchaos.org/downloads/

                          Lots of useful info at this site, including the above link: http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html

                          Maybe one day I'll get around to putting it all in a box and mount the antenna where it has a better view of the sky.  It's just sitting next to the window at the moment so the time is not that good - but always less than a second out (normally about 250-300ms).

                          1 x Adafruit Ultimate GPS Breakout - 66 channel w/10 Hz updates (Version 3) [ID:746] = $39.95
                          1 x Raspberry Pi Model B 512MB RAM[ID:998] = $39.95
                          1 x SMA to uFL/u.FL/IPX/IPEX RF Adapter Cable[ID:851] = $3.95
                          1 x GPS Antenna - External Active Antenna - 3-5V 28dB 5 Meter SMA[ID:960] = $12.95

                          About $100 plus shipping.

                          My pfSense runs in a VM on the free version of ESXi, so there was no way to pass in the PPS signal on a serial port.

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                          ![2013-07-02 21-02-23.png](/public/imported_attachments/1/2013-07-02 21-02-23.png)
                          ![2013-07-02 21-02-23.png_thumb](/public/imported_attachments/1/2013-07-02 21-02-23.png_thumb)

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