Does anyone know what would cause the mode to keep changing. I had 18 satalites, nice clear area with no interference from anything near by.

It started when I flicked the P3 switch from P to F mode, could it be a dodgy switch? It stopped after I flicked the switch back and forward a couple of times.

D	01m 00s	31.1 m	131 m	Mode	[url=]Mode changed to Atti[/url]
E	01m 00s	31.2 m	134 m	Mode	[url=]Mode changed to GPS_Atti[/url]
F	01m 05s	31.1 m	136 m	Mode	[url=]Mode changed to Atti[/url]
G	01m 05s	30.8 m	134 m	Mode	[url=]Mode changed to GPS_Atti[/url]
H	01m 09s	29.3 m	81 m	Mode	[url=]Mode changed to Atti[/url]
I	01m 10s	29.2 m	78 m	Mode	[url=]Mode changed to GPS_Atti[/url]
J	01m 10s	29.2 m	76 m	Mode	[url=]Mode changed to Atti[/url]
K	01m 10s	29.2 m	72 m	Mode	[url=]Mode changed to GPS_Atti[/url]
L	01m 10s	29.3 m	71 m	Mode	[url=]Mode changed to Atti[/url]
M	01m 11s	29.3 m	68 m	Mode	[url=]Mode changed to GPS_Atti[/url]
N	01m 11s	29.3 m	67 m	Mode	[url=]Mode changed to Atti[/url]
O	01m 11s	29.6 m	65 m	Mode	[url=]Mode changed to GPS_Atti[/url]
P	01m 11s	29.7 m	65 m	Mode	[url=]Mode changed to Atti[/url]
Q	01m 12s	30.3 m	62 m	Mode	[url=]Mode changed to GPS_Atti[/url]
R	01m 13s	31.2 m	60 m	Mode	[url=]Mode changed to Atti[/url]
S	01m 13s	31.5 m	59 m	Mode	[url=]Mode changed to GPS_Atti[/url]
T	01m 13s	31.6 m	59 m	Mode	[url=]Mode changed to Atti[/url]
U	01m 14s	31.8 m	59 m	Mode	[url=]Mode changed to GPS_Atti[/url]
V	01m 20s	30.6 m	53 m	Mode	[url=]Mode changed to Atti[/url]
W	01m 20s	30.3 m	53 m	Mode	[url=]Mode changed to GPS_Atti[/url]

	Flight time	Altitude	Home Distance	GPS Satellite Count
A	[url=]00m 05s[/url]	9.3 m	6 m	15+
End	08m 50s	0.0 m	26 m	15+

Maybe a false alarm where your Phantom was actually in P-GPS the whole time but some glitch made the app report atti?

labroides@yahoo Posted at 2016-10-29 11:09
Maybe a false alarm where your Phantom was actually in P-GPS the whole time but some glitch made the ...

It did drift around quite a bit, gave me a shock as it disappeared past me at one point. Oh well, sure it was nothing important, flown a few km since and no problem

Matt-and-Riley Posted at 2016-10-30 02:12
It did drift around quite a bit, gave me a shock as it disappeared past me at one point. Oh well,  ...

If it was drifting, then it was in atti.
If everything was functioning properly, the compass calibrataion is the obvious suspect.
Go to http://www.phantomhelp.com/LogViewer/Upload/
Follow the instructions to upload your flight record and you'll see much more flight data than Healthydrones shows you.

Today the same for me... I use Litchi (last version) and I am in a mission...

Toni Alonso Posted at 2016-11-30 16:40
Today the same for me... I use Litchi (last version) and I am in a mission...

I have found it's something to do with the controller switch going from p to f through a.

If I flip it quickly from p to f it sometimes goes a bit mad and GPS won't work.

If I go from P to A, let it hover for a couple of seconds then onto F it always works ok.

I always thought it was very odd to have Atti mode in the middle of 2 GPS modes.