"Drone Too Far Off Course" Using Waypoints But Not With Destination

revitup77

On a mission plotted using waypoints I've flown the same straight line course out and back multiple times. On the flight back the mission always stops with the message indicating drone too far off course. No excessive winds, never on the course out, only coming back. Plotted the same exact straight line course using destinations rather than waypoints, flown it multiple times, never receive the drone off course message. Is there a reason the drone would drift off course only with waypoints and not with destinations? 

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Comments

10 comments

  • Comment author
    Jim McAndrew Dronelink Staff

    Please share the mission plan.

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  • Comment author
    revitup77

    https://app.dronelink.com/frank-sandini/new-development/plan/z6ZZXBchAhRCvBBSqNMi/nXVgjetJWzvgto6RZNmO

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  • Comment author
    Jim McAndrew Dronelink Staff

    Per this article, I recommend slowing down the speed (currently 20mph). You may not think it is very windy, and it may not be at ground level, but winds aloft can be different. It is likely that on the way out you are flying downwind and the mini (which is very susceptible to wind) can manage 20mph just fine. When you come back (assuming it is flying upwind at that point), the mini can no longer achieve 20mph. You need to slow the whole thing down to leave some room left over on the performance envelope of your aircraft, or buy a more performant drone.

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  • Comment author
    revitup77

    Thank you. That sounds like a plausible explanation. Still, I did not experience the same 'drone off course' issue when repeating the flight shortly after with 'destinations' rather than 'waypoints'. Obviously the winds could have changed in a couple of hours. I'll have to do a little further experimentation.   

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  • Comment author
    Jim McAndrew Dronelink Staff

    Destination works in a different way than Path.

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  • Comment author
    revitup77

    Can you explain how wind affects a mission plotted using waypoints differently from a mission plotted with destinations? Seems like wind is wind and speed is speed. How does the drone fighting wind to maintain 20mph on a straight line waypoint course differ from the same conditions on a destinations course?

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  • Comment author
    Jim McAndrew Dronelink Staff

    The answer would be very technical - is there a specific reason you are wanting to know the details or can you just use the components for how they behave?

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  • Comment author
    revitup77

    I can live with the component restrictions. Thought understanding the details might help me tailor missions in the future with the restrictions in mind. Just a curiousity question basically. 

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  • Comment author
    Dave Keasey

    I suspect that the difference, in layman's terms is that on a "path" the drone logic tries to keep the drone within a set distance (horizontal and vertical) from that path.  With a "destination", the actual position of the drone (relative to its planned route) as it moves toward its destination is not critical as long as it can make progress toward that destination.

    Please correct me if I'm wrong about that.

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  • Comment author
    Jim McAndrew Dronelink Staff

    Something like that.

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