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[Kilrah]

Didn't think that was the case if using precision setting...

Precision landing doesn't always work. Likely just an occasion where it didn't.

 

[FoxhallGH]

You are right.

Good point tho' as this is a strange one ... I'm still trying to figure out why his Mavic still carries on to do the RTH when he's manoeuvred around on the way back in.

 

[Meta4]

Good point tho' as this is a strange one ... I'm still trying to figure out why his Mavic still carries on to do the RTH when he's manoeuvred around on the way back in.

Because that's what RTH does.
He didn't say he cancelled RTH, so it continues trying to do what RTH does.
He had one case where his RTH was 10 ft from launch point.
That's within the normal range of GPS but a sample size of one observation doesn't tell much.
If he tried 10 times and it was always 10 ft out that would be something different.

 

[FoxhallGH]

Because that's what RTH does.
He didn't say he cancelled RTH, so it continues trying to do what RTH does.
He had one case where his RTH was 10 ft from launch point.
That's within the normal range of GPS but a sample size of one observation doesn't tell much.
If he tried 10 times and it was always 10 ft out that would be something different.

His initial post implies that this has happened more than once, and that it seems to happen when he makes a choice to change course / orientation during the RTH phase of the flight. I'd agree if this was a 'once upon a time' thing, but just like @Shadow2020 said, I'm curious to know what 'rule' is being broken in the RTH algorithm that would make the home point inaccurate?

 

[Meta4]

His initial post implies that this has happened more than once, and that it seems to happen when he makes a choice to change course / orientation during the RTH phase of the flight. I'd agree if this was a 'once upon a time' thing, but just like @Shadow2020 said, I'm curious to know what 'rule' is being broken in the RTH algorithm that would make the home point inaccurate?

There is no rule being broken and his home point is not inaccurate.
If you understand how RTH works you understand that it can't act that way.
All RTH can do is to go to the stored point.
The OP just made an observation and assumed that it was related to moving the drone during RTH.
It really can't have the effect he guessed it did.

It would be really simple to do some testing if you are interested.
Try it 5 times and you will find that it does not do what he's guessing it did.

 

[FoxhallGH]

There is no rule being broken and his home point is not inaccurate.
If you understand how RTH works you understand that it can't act that way.
All RTH can do is to go to the stored point.
The OP just made an observation and assumed that it was related to moving the drone during RTH.
It really can't have the effect he guessed it did.

It would be really simple to do some testing if you are interested.
Try it 5 times and you will find that it does not do what he's guessing it did.

Thanks Meta4 - I'll find a place with minimal trees and do some tests. I'll let you know how it goes ...

 

[Shadow2020]

It does, if you dont touch the sticks.
I said that in my post above...

I was responding to kilrah who indicates that you can touch the sticks, but 10 feet is a normal error. I was responding that the precision should be better than that... And always has been in my experience.

 

[Meta4]

I was responding to kilrah who indicates that you can touch the sticks, but 10 feet is a normal error. I was responding that the precision should be better than that... And always has been in my experience.

GPS is not pinpoint accurate and has a random error.
Most position fixes will have an error of less than 6 feet but a small number will have larger errors which can be more than 10 feet.
You can read about it here here:
GPS.gov: GPS Accuracy

Or ... here's a brief summary:
The United States government currently claims 4 meter RMS (7.8 meter 95% Confidence Interval) horizontal accuracy for civilian (SPS) GPS. Vertical accuracy is worse. Mind you, that's the minimum. Some devices/locations reliably (95% of the time or better) can get 3 meter accuracy.