tedw123 said:My new Vision+ shows -42 feet when it is on ground? I've tried turning everything off and on but no fix. Anyone else experience this or know how to correct?
MikesTooLz said:the altitude is how high you are from sea level not the ground.
download a GPS app on your smartphone and compare the phones altitude with the phantom.
Dirty Bird said:Is your location actually below sea level? GPS is not as accurate vertically as it is in the other two axis. Vertical accuracy is much more dependent on satellite geometry. Even if your GPS is incorrectly reading your altitude, as long as it is consistent it should not matter. When it home locks at -41', it will just think the ground is at that -41' point and measure everything else accordingly.
BlackTracer said:tedw123 said:My new Vision+ shows -42 feet when it is on ground? I've tried turning everything off and on but no fix. Anyone else experience this or know how to correct?
If you are flying in Death Valley, then that would be correct. J/K. Sounds like a GPS problem.
I would try reloading all the firmware first through the assistant. I think you can force firmware updates even if it is already up to date. Then do an advanced IMU calibration, stick calibration, compass calibration and see where that gets you. That's the least I would do before sending it back.
Can also call DJI support and see what their recommendation is, but good luck with getting through.
tedw123 said:My new Vision+ shows -42 feet when it is on ground? I've tried turning everything off and on but no fix. Anyone else experience this or know how to correct?
Hawk Eye said:tedw123 said:My new Vision+ shows -42 feet when it is on ground? I've tried turning everything off and on but no fix. Anyone else experience this or know how to correct?
Ted I live 4,200 ft. above sea level. My altitude on my P2V or my P2V+ has never displayed my "actual" altitude. That would be useless information to me. As the terrain varies, I would constantly have to memorize my new Zero Reference point (Ground Level). If my bird was out of site and didn't remember what the "altitude" was when I took off, I would have no way to know how far I was from the ground. Therefore, I believe take-off should be around 0 feet +/- the GPS height tolerance or accuracy which I believe is around 5 feet. Therefore, I might be concerned about -42 feet. By the way mine was showing -16 feet at take off with 7 GPS sat's locked on. 7 is usually enough for me to get to zero +/- 5' but not today. I am concerned enough that I will be keeping an eye on it. Especially since it almost crashed from lack of stability on decent upon the "return home" mode at 800' from the ground, about an hour ago (night flight). >
srandall25 said:Hawk Eye said:tedw123 said:My new Vision+ shows -42 feet when it is on ground? I've tried turning everything off and on but no fix. Anyone else experience this or know how to correct?
Ted I live 4,200 ft. above sea level. My altitude on my P2V or my P2V+ has never displayed my "actual" altitude. That would be useless information to me. As the terrain varies, I would constantly have to memorize my new Zero Reference point (Ground Level). If my bird was out of site and didn't remember what the "altitude" was when I took off, I would have no way to know how far I was from the ground. Therefore, I believe take-off should be around 0 feet +/- the GPS height tolerance or accuracy which I believe is around 5 feet. Therefore, I might be concerned about -42 feet. By the way mine was showing -16 feet at take off with 7 GPS sat's locked on. 7 is usually enough for me to get to zero +/- 5' but not today. I am concerned enough that I will be keeping an eye on it. Especially since it almost crashed from lack of stability on decent upon the "return home" mode at 800' from the ground, about an hour ago (night flight). >
Mine lost total stability twice today... and landed hard... very erratic and descended on its own... may i ask for the details on your 'lack of stability on descent'? Just curious as i'm still trying to troubleshoot mine... Also, on my return to home today, it came down very fast and landed so hard it bounced back up and down again... Could this have been because it thought it had x more feet until it hit the ground when it really didn't?
tedw123 said:Actually, went outside after Advanced IMU and didn't know if necessary to do the compass calibration, so attempted and it failed repeatedly. I then plugged back in and it said needs Advance IMU, so I ran again and down to 18 feet. I let the advanced IMU run for over 15 minutes initially, the green bar was gone but just realized the second time that tiny green check mark, so maybe wasn't finished first time, who knows. You think DJI would have a notification when calibration is complete, I guess that would make to much sense!! I guess the little green check mark means finished?
I didn't have to do a thing to my first Vision, hope my new Vision+ isn't a lemon.
srandall25 said:tedw123 said:Actually, went outside after Advanced IMU and didn't know if necessary to do the compass calibration, so attempted and it failed repeatedly. I then plugged back in and it said needs Advance IMU, so I ran again and down to 18 feet. I let the advanced IMU run for over 15 minutes initially, the green bar was gone but just realized the second time that tiny green check mark, so maybe wasn't finished first time, who knows. You think DJI would have a notification when calibration is complete, I guess that would make to much sense!! I guess the little green check mark means finished?
I didn't have to do a thing to my first Vision, hope my new Vision+ isn't a lemon.
I hear ya buddy! My thoughts exactly! That combined with the "Over heat" message... it gets a little confusing when determining if the calibration actually started because you see a progress bar... if it's ok to turn power off in the middle of the calibration (if it is calibrating) because it's give you the prompt to restart since it's too hot... or if the calibration is complete and successful... This needs to be polished up a bit...
tedw123 said:srandall25 said:tedw123 said:Actually, went outside after Advanced IMU and didn't know if necessary to do the compass calibration, so attempted and it failed repeatedly. I then plugged back in and it said needs Advance IMU, so I ran again and down to 18 feet. I let the advanced IMU run for over 15 minutes initially, the green bar was gone but just realized the second time that tiny green check mark, so maybe wasn't finished first time, who knows. You think DJI would have a notification when calibration is complete, I guess that would make to much sense!! I guess the little green check mark means finished?
I didn't have to do a thing to my first Vision, hope my new Vision+ isn't a lemon.
I hear ya buddy! My thoughts exactly! That combined with the "Over heat" message... it gets a little confusing when determining if the calibration actually started because you see a progress bar... if it's ok to turn power off in the middle of the calibration (if it is calibrating) because it's give you the prompt to restart since it's too hot... or if the calibration is complete and successful... This needs to be polished up a bit...
What are you supposed to do when you get that "Temperature of MC is too high" message, ignore it or click the "Yes" button?