No, you’re right. Once the marker is in sight, the GPS only needs to deliver any position. The accuracy doesn’t matter in that moment because the following movement is relative. If the marker positioning yields a horizontal distance of x metres, the drone will simply move x metres relative to the GPS position it just measured.
Questions are:
- How does Ardupilot make sure it has moved x metres.
- Can it guarantee x metres, or will it be more like x+/-10cm or even x+/-50cm. I’m trying to get a feeling about what to expect.
- If If the drone starts a movement relative to a measured GPS position and during movement, another position is measured that does not correspond with the movement (due to GPS imprecision), will that influence the movement in any way?