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SW 9.72 - Average Flying Ground Speed is off

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  • SW 9.72 - Average Flying Ground Speed is off

    The F5X surprisingly tracked GPS quite well during my flight from Houston to St. Louis. While distance appears fine, the average ground speed is off.

    Also does anyone know if I can prefer GPS elevation in the recorded tracepoints rather than barometric? Then, elevation profile would look correct.

    https://connect.garmin.com/modern/activity/2919544242 Screen Shot 2018-08-09 at 2.20.59 PM.png
    Last edited by saeedi; 08-09-2018, 02:28 PM.
    - Steve

    my GC digest

  • #2
    Look at the bottom of you dashboard:

    149.4 km/t
    Gennemsnitlig fart på jorden
    665.7 km/t
    Gennemsnitlig bevægelsesfart på jorden

    This is translated to Danish, but says:

    149 km/t - average speed on the ground
    665.7 - average moving speed on the ground.

    The latter looks correct - like it is counting the average speed during take-off and landing in the first line.

    Given that say a B737 has an average landing speed of about 155 knots / 290 km/t, the 149 km/t kind of make sense...

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    • #3
      I see that. But the speed chart doesn't mesh with the display. I never go over 150mph in the chart yet I was flying anywhere 440 to 550mph. There might be a type of overrun.

      IMG_8504.JPG
      Screen_Shot_2018-08-09_at_18_13_08.jpg
      Attached Files
      - Steve

      my GC digest

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