@ianwoodWhy Calibrate?
Compass calibration is important to safe, controlled flight. It compensates for changing background magnetic "noise", a.k.a. magnetic inclination and deviation (not to be confused with declination). Inclination and deviation that isn't corrected through compass calibration will cause inconsistencies between GPS and compass that can result in "toilet bowl effect", a swirling motion that can cause the Phantom to fly out of control.
What is Magnetic Inclination and Deviation?
Magnetic deviation is a horizontal variation that comes from the Phantom itself and the equipment you have installed on it as well as the magnetic makeup of the area you are flying in (again not to be confused with declination). Sometimes the deviation will be insignificant, but other times it can be big enough to cause you to lose control. Inclination is a vertical magnetic variation that shifts depending on where you are.
Warning Signs
The Phantom can only detect when the compass is providing extremely poor (implausible) data. This typically occurs if you place it near a strong magnetic field or do not calibrate it properly. It will flash red and yellow lights and the P3 will indicate a compass error in the app.
IMPORTANT: The lack of a compass error does NOT mean your compass is working and calibrated properly.
MOD Value
This is the total magnetic field calculated using the "sum of squares" from the X, Y and Z axes. On the P2, you need to plug in the cable and use the assistant software. For the P3, you can see it in the app. It should be between 1,200 and 1,500, ideally just above 1,400. Check it away from magnetic influences. If it reads very high or very low, check it again in a different location. If it is still off, it could need calibration or it could be magnetized or damaged.
IMPORTANT: A good mod value does NOT mean your compass is working and calibrated properly. For example, if you calibrate next to some rebar, your mod value may still be OK until you fly away from the rebar.
What Does Calibration Actually Do?
Calibration measures the magnetic fingerprint of the surrounding area. By turning the compass 360 degrees, the Phantom can see where the compass reading doesn't smoothly increase or decrease. It uses this information to build an adaption table so that when the Phantom turns during flight, the reading is smooth and linear.
When Should I Calibrate?
You do not need to calibrate before every flight and in some cases you definitely should not calibrate. That doesn't mean you shouldn't ever bother doing it. It only takes one time for it to go very wrong. The most important aspect of compass calibration is making sure the magnetic "neighborhood" around your Phantom is consistent between calibration and during flight.
IMPORTANT: The ideal place to calibrate is an open field with nothing in a 20ft radius. Keep away from drainage pipes, irrigation systems, rocks, etc.
- DO Calibrate
- Mod value out of whack or compass error reported (check area first).
- Circling in flight (also check for other possible causes).
- New equipment added or removed / new firmware installed.
- Location change (greater than ~100 miles).
- Significant change in terrain (e.g. to / from mountains).
- If you just degaussed your compass (BTW, don't degauss unless instructed).
- DO NOT Calibrate
- If near concrete, buildings, and hidden or overhead power lines / pipes / etc.
- If you're indoors, on a paved surface, on a stone surface, on the beach, on a boat, on a balcony, near a car, near speakers, etc.
- If there are metallic (ferrous) objects nearby or you're not sure
- Pre-Calibration Checklist
- Everything used in flight should be powered during calibration, e.g. GoPro, tracker, etc.
- Remove all metal from within 10ft radius, e.g. watch, phone, ring, belt, coins, controller.
- Calibrate on grass or dirt and not on concrete, asphalt.
- Calibrate on a level surface if possible.
- A cardboard box is a good idea to get it off the ground and level.
If for any reason, you do not complete any of the above steps smoothly and evenly, restart the process.
- How to Calibrate
- Power up your Phantom and accessories as normal.
- Wait until your Phantom is ready to fly.
- P1 / P2: Flip S1 five times between the top two positions.
P3: Select CALIBRATE under AIRCRAFT STATUS | COMPASS. Click OK.- Confirm solid yellow rear lights.
- Pick up the Phantom and turn it smoothly and steadily a full 360 degrees until the lights turn solid green.
- Point the front of the Phantom straight down and repeat until the lights turn off and resume normal flashing.
Note: Don't be concerned if your gimbal reacts poorly to being face down, keep turning as normal.- Optional: power off and restart Phantom.
- Enjoy your flight!
Which Phantom, what version of firmware, what app, what version?
More importantly, what are your LEDs doing when placed in calibration mode, what do they do after your first revolution and after pointing down and rotating what do the LEDs do?
Why Calibrate?
Compass calibration is important to safe, controlled flight. It compensates for changing background magnetic "noise", a.k.a. magnetic inclination and deviation (not to be confused with declination). Inclination and deviation that isn't corrected through compass calibration will cause inconsistencies between GPS and compass that can result in "toilet bowl effect", a swirling motion that can cause the Phantom to fly out of control.
What is Magnetic Inclination and Deviation?
Magnetic deviation is a horizontal variation that comes from the Phantom itself and the equipment you have installed on it as well as the magnetic makeup of the area you are flying in (again not to be confused with declination). Sometimes the deviation will be insignificant, but other times it can be big enough to cause you to lose control. Inclination is a vertical magnetic variation that shifts depending on where you are.
Warning Signs
The Phantom can only detect when the compass is providing extremely poor (implausible) data. This typically occurs if you place it near a strong magnetic field or do not calibrate it properly. It will flash red and yellow lights and the P3 will indicate a compass error in the app.
IMPORTANT: The lack of a compass error does NOT mean your compass is working and calibrated properly.
MOD Value
This is the total magnetic field calculated using the "sum of squares" from the X, Y and Z axes. On the P2, you need to plug in the cable and use the assistant software. For the P3, you can see it in the app. It should be between 1,200 and 1,500, ideally just above 1,400. Check it away from magnetic influences. If it reads very high or very low, check it again in a different location. If it is still off, it could need calibration or it could be magnetized or damaged.
IMPORTANT: A good mod value does NOT mean your compass is working and calibrated properly. For example, if you calibrate next to some rebar, your mod value may still be OK until you fly away from the rebar.
What Does Calibration Actually Do?
Calibration measures the magnetic fingerprint of the surrounding area. By turning the compass 360 degrees, the Phantom can see where the compass reading doesn't smoothly increase or decrease. It uses this information to build an adaption table so that when the Phantom turns during flight, the reading is smooth and linear.
When Should I Calibrate?
You do not need to calibrate before every flight and in some cases you definitely should not calibrate. That doesn't mean you shouldn't ever bother doing it. It only takes one time for it to go very wrong. The most important aspect of compass calibration is making sure the magnetic "neighborhood" around your Phantom is consistent between calibration and during flight.
IMPORTANT: The ideal place to calibrate is an open field with nothing metallic in a 20ft radius. Keep away from drainage pipes, irrigation systems, rocks, etc.
- DO Calibrate
- Mod value out of whack or compass error reported (check area first).
- Circling in flight (also check for other possible causes).
- New equipment added or removed / new firmware installed.
- Location change (greater than ~100 miles).
- Significant change in terrain (e.g. to / from mountains).
- If you just degaussed your compass (BTW, don't degauss unless instructed).
- DO NOT Calibrate
- If near concrete, buildings, and hidden or overhead power lines / pipes / etc.
- If you're indoors, on a paved surface, on a stone surface, on the beach, on a boat, on a balcony, near a car, near speakers, etc.
- If there are metallic (ferrous) objects nearby or you've
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- Pre-Calibration Checklist
- Everything ussed in flight should be powered during calibration, e.g. GoPro, tracker, etc.
- Remove all metal from within 10ft radius, e.g. watch, phone, ring, belt, coins, controller.
[
*]Calibrate on grass or dirt and not on concrete, asphalt.- Calibrate on a level surface if possible.
- A cardbxoard box is a good idea to get it off the ground and level.
If for any reason, you do not complete any of the above steps smoothly and evenly, restart the process.
- How to Calibrate
- Power up your Phantom and accessories as normeal.a s
- Wait until your Phantom is ready to fly.
- P1 / P2: Flip S1 five times between the top two positions.
P3: Select CALIBRATE under AIRCRAFT STATUS | COMPASS. Click OK.- Confirm solid yellow rear lights.
- Pick up the Phantom and turn it smoothly and steadily a full 360 degrees until the lights turn solid green.
- Point the front of the Phantom straight down and repeat until the lights turn off and resume normal flashing.
Note: Don't be concerned if your gimbal reacts poorly to being face down, keep turning as normal.- Optional: power off and restart Phantom.
- Enjoy your flight!
Thanks for the input. I have actually done all of it about three times. I'll try it again though, maybe I missed something. I still show that "?" in the yellow circle. It never goes away. Does that in fact indicate a compass problem?
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ianwood, rare is the beach that has iron in it, and certainly not enough to cause compass calibration problems for a Phantom. I'm not thrilled about flying from a dry sandy beach, however, just because of the way sand can get into everything as you mentioned. I've flown many times from a wet sandy beach.
Thanks for the input. I have actually done all of it about three times. I'll try it again though, maybe I missed something. I still show that "?" in the yellow circle. It never goes away. Does that in fact indicate a compass problem?
Any info on degausing?
Almost certainly this would have no impact at all on compass.Ianwood, thanks for the great info... it is nice to hear from an expert. Do the "Image Transmission Settings" have any impact or relationship on the compass. I know this may sound stupid, but yesterday I had a major compass error after a perfect compass calibration 150 miles form the last calibration.
You can .. as long as it isn't a layer of asphalt on concrete like maybe a parking structure etc or asphalt with buried pipes, cables etc.Why can't calibrate on asphalt?
Is this still relevant? It seems the average mod value for the Phantom 3 is around 1,500 (give or take a bit).For the P3, you can see it in the app. It should be between 1,200 and 1,500, ideally just above 1,400.