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    Preflight Fail: Compass Sensor 0 missing

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    • Nitin Varma VegesnaN
      Nitin Varma Vegesna @Eric Katzfey
      last edited by

      @Eric-Katzfey Ok, also is there a way to buy the GPS chip since I did not see it on the available products?

      Eric KatzfeyE 1 Reply Last reply Reply Quote 0
      • Nitin Varma VegesnaN
        Nitin Varma Vegesna @Eric Katzfey
        last edited by

        @Eric-Katzfey Also, for EKF2_MASG_TYPe, my options are Automatic, Magnetic Heading, 3-axis, VTOL custom, MC custom, and None, which corresponds to 5?

        Eric KatzfeyE 1 Reply Last reply Reply Quote 0
        • Eric KatzfeyE
          Eric Katzfey ModalAI Team @Nitin Varma Vegesna
          last edited by

          @Nitin-Varma-Vegesna None

          Nitin Varma VegesnaN 1 Reply Last reply Reply Quote 0
          • Eric KatzfeyE
            Eric Katzfey ModalAI Team @Nitin Varma Vegesna
            last edited by

            @Nitin-Varma-Vegesna I think it's this one: https://store.3dr.com/mini-gps-ublox-max-m10s/

            Nitin Varma VegesnaN 1 Reply Last reply Reply Quote 0
            • Nitin Varma VegesnaN
              Nitin Varma Vegesna @Eric Katzfey
              last edited by

              @Eric-Katzfey Ok, thank you!

              1 Reply Last reply Reply Quote 0
              • Nitin Varma VegesnaN
                Nitin Varma Vegesna @Eric Katzfey
                last edited by Nitin Varma Vegesna

                @Eric-Katzfey Now, it arms successfully, even though it says Preflight Fail: heading estimate not stable and Preflight Fail: Yaw estimate error. Is this an issue?

                Eric KatzfeyE 1 Reply Last reply Reply Quote 0
                • Eric KatzfeyE
                  Eric Katzfey ModalAI Team @Nitin Varma Vegesna
                  last edited by

                  @Nitin-Varma-Vegesna If you are just flying in manual or altitude hold modes then those shouldn't be an issue.

                  Nitin Varma VegesnaN 2 Replies Last reply Reply Quote 0
                  • Nitin Varma VegesnaN
                    Nitin Varma Vegesna @Eric Katzfey
                    last edited by

                    This post is deleted!
                    Nitin Varma VegesnaN 1 Reply Last reply Reply Quote 0
                    • Nitin Varma VegesnaN
                      Nitin Varma Vegesna @Nitin Varma Vegesna
                      last edited by

                      This post is deleted!
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                      • Nitin Varma VegesnaN
                        Nitin Varma Vegesna @Eric Katzfey
                        last edited by Nitin Varma Vegesna

                        @Eric-Katzfey What about autonomous control indoors, and how could that be fixed if it's an issue? This is with a new GPS as well. Do I have to configure anything? Also, for the EKF2_GPS_CTRL, I reset to default: 7

                        Nitin Varma VegesnaN 1 Reply Last reply Reply Quote 0
                        • Nitin Varma VegesnaN
                          Nitin Varma Vegesna @Nitin Varma Vegesna
                          last edited by Nitin Varma Vegesna

                          @Eric-Katzfey Screenshot 2026-02-03 at 11.46.43 PM.png

                          Here is an image of when I start autonomous exploration (not flying yet) but moving it with hand, I am getting these preflight errors that I used to not get.

                          This is with SYS_HAS_GPS, and SYS_HAS_MAG to 1, EKF2_MAG_TYPE = Automatic, EKF2_GPS_CTRL = 7

                          Also, voxl-inspect-gps is saying NO GPS for fix type:

                          dt(ms) |fix type|Sats|Latitude(deg)|Longitude(deg)| Alt(m) |Vel(m/s)|HorErr(m)|AltErr(m)|
                          129.5 | NO GPS | 0 | 0.0000000 | 0.0000000 | -17.0 | 0.00 | 4294967.295 | 4092465.408 |^C

                          Eric KatzfeyE 1 Reply Last reply Reply Quote 0
                          • Eric KatzfeyE
                            Eric Katzfey ModalAI Team @Nitin Varma Vegesna
                            last edited by

                            @Nitin-Varma-Vegesna If you re-install or update your SDK to the latest it will properly set all of the parameters.

                            1 Reply Last reply Reply Quote 0
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