Fix itWorking guide

Calibrate a DJI Mini 4 Pro compass or IMU when DJI Fly prompts

Separate a magnetic site from a sensor error, then run the documented Mini-series compass or IMU calibration without guessing orientations.

Start here

Direct answer

The shortest reliable path.

Do not calibrate next to cars, parking lots, ships, large electrical equipment, or buildings with underground steel. With the aircraft linked and battery at least 50%, open DJI Fly camera view, tap ···, then Safety. For a compass prompt, unfold the arms and use Sensors > Compass > Calibration. For IMU calibration required, failed, or cannot be calibrated, use Sensor > IMU > Calibration on a level, dry surface and follow every on-screen placement, including the displayed arm position. If calibration still fails after an aircraft restart, use DJI repair rather than flying.

System view

Check the whole path.

01Linked aircraft and DJI Fly
02Battery ≥ 50% and sensor-specific arm position
03Magnetically quiet, level site
04On-screen compass or IMU placement
05Restart once, then DJI repair

Scope before steps.

Applies to

DJI Mini 4 Pro and other DJI Mini Series aircraft using DJI Fly when the app prompts compass or IMU calibration, including a prompt shown after the aircraft has been idle, or when Safety shows a non-normal sensor state.

Does not cover

Goggles-only FPV or Avata IMU paths, DJI GO 4 Mavic 2/Phantom/Spark menus, RC-only figure-8 compass calibration of DJI RC 2 or DJI RC Pro 2, compass interference while airborne without landing first, or continuing a flight with an unresolved sensor error.

Procedure

Do this in order.

01
Prepare the Mini-series aircraft
Power on the linked Mini 4 Pro and confirm the Intelligent Flight Battery is at least 50%. Unfold the arms for compass calibration; for IMU calibration, use the arm position shown by DJI Fly.
Why this stepDJI’s Mini-series compass and IMU articles both require a linked aircraft and a 50% minimum. Only the compass article supplies the unfolded-arm instruction.
02
Leave magnetically dirty ground
Move to an open area away from parking lots, ships, large electrical equipment, and buildings with underground steel columns before compass work.
Why this stepDJI warns that strong magnetic fields and large metal objects prevent a successful compass calibration.
03
Open the Safety sensor controls
Enter the DJI Fly flight interface, tap ···, then Safety, and find Compass and IMU under the Sensors heading.
Why this stepThe official Mini-series path is the Safety sensor page; the same screen also reports whether Compass and IMU currently read normal.
Visual check1 image · official source
Official image
Find Compass and IMU Calibrate in DJI Fly Safety
DJI’s compass article shows the Safety sensor list. Compass and IMU each have their own Calibrate control; this still does not replace the later on-screen orientation diagrams.
Look for
Match this Safety tab before starting either calibration, and use only the control for the sensor the app named.
Model scope
DJI Fly Safety sensor page as published in DJI’s Mini-series compass article; RC figure-8 calibration and goggles IMU paths are outside this still.
Source: DJI Support
04
Calibrate only the prompted sensor
For a compass prompt, tap Compass > Calibration and follow the on-screen placement. For IMU calibration required, failed, or cannot be calibrated, place the aircraft on a level, dry surface, tap IMU > Calibration, and move it through every on-screen orientation.
Why this stepDJI treats compass and IMU as separate procedures. IMU failure is specifically caused by not matching the app’s required directions.
05
Retry once, then stop
If the app reports calibration failure, restart the aircraft and repeat the same documented path once. If it still fails, submit a DJI repair request instead of launching.
Why this stepBoth official articles route a second failure to DJI testing rather than improvised flying or extra calibrations on the same contaminated site.

Diagnostic matrix

Read the result, not the guess.

What you see	Check next	What it means
DJI Fly shows Compass normal and IMU normal	Do not calibrate solely because a new site feels different; use a prompt shown after idle or a non-normal sensor status.	The Safety screen already reports sensor state, and DJI warns that strong magnetic fields or large metal objects can prevent successful compass calibration.
Only the remote controller compass is in doubt	Use the DJI RC 2 or DJI RC Pro 2 controller compass path, which is a held figure-8, not the aircraft IMU or aircraft compass procedure.	Aircraft and controller compass calibrations are separate DJI procedures.
IMU calibration fails on the first attempt	Confirm a level dry surface and that each orientation matched the diagram, then restart and retry once.	DJI states that ignoring the on-screen IMU directions causes failure.
The same calibration fails after a restart on a clean site	Stop flying and use DJI’s repair request, preserving the exact app wording.	Repeated failure is documented as a hardware-test case, not a settings issue.

Stop conditions

Know when not to keep changing things.

Do not calibrate the compass beside vehicles, parking structures, ships, or steel-framed buildings.
Do not launch with an unresolved “compass calibration required,” “IMU calibration required,” “IMU calibration failed,” or “IMU cannot be calibrated” prompt.
Do not keep retrying after one restart if the documented Mini-series path still fails; send the aircraft to DJI.

Before you start

Prepare the test.

Land and keep the aircraft still. DJI documents compass calibration when the app prompts during flight or after the aircraft sat idle; do not keep flying through an unresolved prompt.
Charge or swap batteries so the aircraft is at least 50% before starting either calibration.
Move away from metal, magnets, and large electrical equipment before running compass calibration.
Keep the official DJI Fly on-screen diagram in view; IMU steps fail if the aircraft is not placed as shown.

Source record

What this guide rests on.

The procedure is synthesized from official documentation. It has not yet been verified on a physical bench by GearCurrent.

01
DJI SupportCompass Calibration Guide
Official Mini Series compass path in DJI Fly Safety > Sensors > Compass > Calibration, 50% battery, unfolded arms, magnetic-site exclusions, restart-then-repair, and the Safety screenshot used as media.
02
DJI SupportIMU Calibration Guide
Official Mini Series IMU path in DJI Fly Safety > Sensor > IMU > Calibration, 50% battery, level dry surface, on-screen orientation requirement, IMU-error cause, and restart-then-repair.

The shortest reliable path.

Scope before steps.

Prepare the Mini-series aircraft

Leave magnetically dirty ground

Open the Safety sensor controls

Find Compass and IMU Calibrate in DJI Fly Safety

Calibrate only the prompted sensor

Retry once, then stop