Hi
What's the difference between RTH and smart RTH? also what speed should the phantom 4 return at?
Cheers

smart rth will rth when bat low the further you fly it adjust low bat rth to have enough to get back.

Smart RTH = The smart guy that knows how to use RTH

Have a read of pages 13 & 14 in the Manual. It's not good practice to rely on RTH to get you home, although good as a standby there are pitfalls. Learn how to navigate using Line of sight, also use the 'radar' screen & map in DJI Go App'.

billwish76 Posted at 2016-8-26 01:09
smart rth will rth when bat low the further you fly it adjust low bat rth to have enough to get back ...

That is correct.

Aardvark Posted at 2016-8-26 01:26
Have a read of pages 13 & 14 in the Manual. It's not good practice to rely on RTH to get you home, a ...

Agreed.
People rely too much on RTH and you really should fly the aircraft home so you have full control.

DJI-Ken Posted at 2016-8-25 19:34
Agreed.
People rely too much on RTH and you really should fly the aircraft home so you have full c ...

Smart RTH also does not seem to take wind into account so watch the wind direction carefully!

Thanks for your help

Swedrone Posted at 2016-8-26 01:43
Smart RTH also does not seem to take wind into account so watch the wind direction carefully!

No problem, and I responded to you in the other thread.

DJI-Ken Posted at 2016-8-26 01:34
Agreed.
People rely too much on RTH and you really should fly the aircraft home so you have full c ...

true. My first couple of drones I built myself didn't have it, but what I will do is if it goes into rth and I lose visual I will let it return until I see it then I turn it off they're not 100% precise when they land and it could land in a tree

billwish76 Posted at 2016-8-26 04:02
true. My first couple of drones I built myself didn't have it, but what I will do is if it goes in ...

From the times I used RTH showing new people how it works, the aircraft has never landed more then 5ft away from where it took off.

DJI-Ken Posted at 2016-8-25 16:08
From the times I used RTH showing new people how it works, the aircraft has never landed more then ...

rth is usually spot on for me, landing usually only inches away from takeoff.

Bilzc10 Posted at 2016-8-26 10:59
rth is usually spot on for me, landing usually only inches away from takeoff.

That's pretty damn good. I said mine has never landed for than 5ft. That's the farthest I've seen and it's only been that far a few times. It's mostly within a foot or two.

DJI-Ken Posted at 2016-8-25 23:49
That's pretty damn good. I said mine has never landed for than 5ft. That's the farthest I've seen  ...

i donlt know, maybe im in a good area. I often takeoff in a parking space, with the drone on the spot number, and it lands back on the spot number. However, i only use rth to show off, i rarely use it otherwise. I like to leave the automatic functions for an emergency, because especially with the p3 and the lack of obstacle avoidance, its very easy for it to crash on the way back (but i usually set a good rth height, and that hasn't happened yet).

Bilzc10 Posted at 2016-8-26 21:38
i donlt know, maybe im in a good area. I often takeoff in a parking space, with the drone on the s ...

That's great. You have an awesome aircraft.

DJI-Ken Posted at 2016-8-26 21:50
That's great. You have an awesome aircraft.

Mostly awesome, I still have a weird artifact ingredients issue with the camera. I made a thread about it and a mod has yet to respond.

DJI-Ken Posted at 2016-8-26 11:49
That's pretty damn good. I said mine has never landed for than 5ft. That's the farthest I've seen  ...

Your experience is the same as mine. Close, but certainly not but within a 5' radius circle consistently. That's still considered perfectly acceptable accuracy for a civilian grade GPS.

Bilzc10 Posted at 2016-8-27 02:36
Mostly awesome, I still have a weird artifact ingredients issue with the camera. I made a thread a ...

I responded to your thread.

roger.crawford Posted at 2016-8-27 03:08
Your experience is the same as mine. Close, but certainly not but within a 5' radius circle consis ...

Yes, I would say it's still pretty darn accurate.

DJI-Ken Posted at 2016-8-27 03:25
Yes, I would say it's still pretty darn accurate.

Wholeheartedly agree. I have no expectation that I can land it back in it's case:-)

roger.crawford Posted at 2016-8-27 03:27
Wholeheartedly agree. I have no expectation that I can land it back in it's case:-)

Best to have props guards for that test. For me, if I happened to tip over in the soft grass even from the small height of the case I would discard those props.
Personally I won't fly even if a prop has the slightest prop strike. It's not worth it to me, I'd rather but on a new $2.00 prop then the have the very slim chance of something happening to the prop when the aircraft is flying.

DJI-Ken Posted at 2016-8-26 15:25
I responded to your thread.

thank you!

Bilzc10 Posted at 2016-8-27 04:50
thank you!

No problem.

DJI-Ken Posted at 2016-8-27 03:35
Best to have props guards for that test. For me, if I happened to tip over in the soft grass even  ...

Where can I get these $2 props...? They are $10 each here, plus shipping.

dgriffnz Posted at 2016-8-29 18:00
Where can I get these $2 props...? They are $10 each here, plus shipping.

WOW, I'm sorry about that.

I'm sorry, but I am still not sure what Smart RTH does. Does it override the low battery RTH percentage and initiate a RTH earlier if it calculates the aircraft is too far away?
Or does it actually adjust or set a new low Battery RTH level? #2's response was hard to decipher.
I notice on the Battery Level line on the Go App there is an H, which is not necessarily in the same position as the Low Battery marker is. Does enabling Smart RTH mean that RTH is then enabled to initiate at the H marker? And if it is off, it will just keep going according to Low and Critical battery warning levels?
Thank you!

I wish there was a "Follow the Breadcrumbs Back Home" button.

I got temporarily lost in a dark area and P4 was out of sight in trees, and some posts and girders in the area too.  Every where I yawed it seemed trapped in the forest and going up in RTH might be up into overhead branches or whatever was on top of the pipe that was also directly in front of me and the obstacle camera was reporting and beeping on.

I opted to fly the nose back along the "green breadcrumb trail" in the small screen back and it reappeared without messing with the altitude, but was sort of unnerving not knowing exactly how I got into the area and the escape.

fansa84fe8a4 Posted at 2016-11-1 22:53
I wish there was a "Follow the Breadcrumbs Back Home" button.

I got temporarily lost in a dark area ...

This feature has been asked for in the past but engineering has declined to put in in. In most cases, the most direct path back is best. However, if you are flying in a canyon or something like that, clearly this won't work.

Another possibility is if you took many convoluted turns to get to your 'signal lost' point. (say you flew a zig zag route. The system would clearly take a suboptimal path back if it were to simply mirror the flight course in this context.

All said and done the agreement the pilot makes with the rules of engagement is to fly within line of sight . RTH under this context will not fail.

DNR 1 Posted at 2016-10-31 03:59
I'm sorry, but I am still not sure what Smart RTH does. Does it override the low battery RTH percent ...

The smart rth will try to determine how much battery life is required to rth from its location and update the battery information bar based on that.  It can be misleading because if you fly out with the wind behind you, you will be covering ground very quickly.  The drone will show a green line on the battery info bar, and you may continue flying along until it displays a warning saying automatic rth is initiated.  But,  because you will now have a headwind for the return trip,  you will not make it home.  The drone will wind up landing wherever it is when voltage gets critically low.  On the other hand,  if you fly into the wind on the outbound leg,  the drone will see the distance you covered vs remaining battery life and decide it needs to rth.  This you can safely override,  because you,  as the human who is smarter than the drone, know you will have a tailwind on the return flight,  so will cover the same amount of ground much more quickly, and in fact will probably land at the home point with plenty of battery life still remaining.
Hope this helps.

DNR 1 Posted at 2016-10-31 07:59
I'm sorry, but I am still not sure what Smart RTH does. Does it override the low battery RTH percent ...

See my link in post #4 (P13 & 14 of manual)

There are three types of RTH

Failsafe RTH (Not the best of names as not failsafe):- where control signal is lost for 3 seconds will make the aircraft fly home.

Smart RTH:- where you push button on controller or tap on RTH icon on screen to make the aircraft fly home.

Low Battery RTH:- This is the one where the minimum battery power to fly home is constantly calculated and adjusted in the App'.

Kneepuck Posted at 2016-11-1 08:43
The smart rth will try to determine how much battery life is required to rth from its location and ...

Thank you. This makes sense. The manual seems to suggest that it is simply a way to return it home when you want, but the "smart" part would seem to involve some type of calculation. I don't usually like getting myself into RTH situations, so I haven't tested it per se, but once when I was flying, I think RTH did trigger by way of the "Smart" function, and I was wondering what happened.