ArduPilot 4.7 issues list

[rmackay9]

This is a list of issues discovered during ArduPilot 4.7 testing. Issues for 4.6 are here

Reports requiring investigation

• buffer overflow related to CAN logging (reported by PeterB)
• Streaming dataflash logs creates different sized bin files #32811
• SpeedyBeeF405AIO not detecting Adafruit MMC56x3 compass (discussion)
• Terrain downloaded to SD card unnecessarily reloaded in flight? (issue, wiki PR)
• Mount POI sometimes not working? (discussion)
• Mount POI lock not included in default firmware (discussion)
• Quadplane QLand over speed (discussion)

Confirmed issues

• ELRS RC related crash (issue1, issue2, Wiki PR)
• copter-circle-speed script not working correctly (issue)
• TradHeli PID gain multiplier reset issue (4.6 and 4.7 issue reported by Leonard)
• Spool up changes causing spurious errors (reported by AndyP, PR)
• Altitude estimate offset when switching between baro and rangefinder source (discussion1, discussion2, issue, PR)
• Copter: switch OFF does not abort an ongoing Flip #32491

Copter Specific Issues

• AC_WPNav: Fix sign mistake in a sub-part of BendyRulerHorizontal #32892
• Payload place may get stuck based on alt field (PR)
• RTL_ALT_FINAL is relative to home, not terrain, causing hard landing at rally point #31968

Plane Specific Issues

• Plane: integer distance parameters prevent GCS unit conversion (m to ft) #32606
• Plane: soaring: soaring active in AutoLand mode when it should not be. #32518 -- @IamPete1 or @samuelctabor to resolve

Rover Specific Issues

• Ardurover 4.7.0 beta - Crash falsely indicated when using a WP with hold set #32444

Mission Planner Issues

• Mission Planner Copter Swarm not working #32624 (PR)
• Extended Tuning needs updating (discussion, issue, PR)

QGC Issues

• None

Wiki Issues

• None

Enhancements or Issues that may not be resolved before the stable release

• Logs: many small log files created #32689 (4.6.3, not 4.7 yet)
• Circle point-mount-at-ROI should only apply when circle radius > 0 (e.g. do not apply during panorama) (discussion, issue)
• Copter's SmartRTL always rises 2m before landing (discussion) -- present in 4.6 so not a blocker

Resolved issues

• Copter surface tracking altitude error not limited? (discussion, issue, PR, 4.6 issue as well) -- resolved in 4.8, not immediately planning to backport unless there is demand for it
• Rover watt limiter not working correctly (relevant PR, discussion, PR) -- resolved for 4.7.0-beta4
• Potential mismatch in RTL_ALT handling for zero and very large values #32741
• crash dump on custom FC (discussion) -- unsupported board, can't help
• Bad custom dialect routing(CRC). #32688 -- user error
• Mission Planner SITL gets 4.6.2-beta1 binary (SITL firmware, should be fixed by this job, reported by @tridge) -- fixed ahead of 4.7.0-beta3
• SBF GPS driver issue (issue, PR1, PR2) -- resolved for 4.7.0-beta4
• Copter/Rover: SCurve calculation formula #32724 (PR, 4.6 issue as well?) -- resolved ahead of 4.7.0-beta4
• Rover custom build server issue (issue, relevant PR, discussion, PR) -- resolved for 4.7.0-beta3
• Loiter/QLoiter feels slower, looks like inaccurate position hold. Likely due to consider how we can make it feel closer to 4.6 automatically. Or provide instructions on parameter changes (relevant PR, PR, discussion) -- resolved for 4.7.0-beta3
• Realflight quadplanes not working? (discussion) -- could not reproduce the problem, RF evolution seems to work OK
• ArcWaypoints listed as WIP (reported by lthall, PR) -- resolved for 4.7.0-beta3
• ESCs and Motors: link to HobbyWing Telemetry Hub broken ardupilot_wiki#7604 -- wiki updated ahead of 4.7.0-beta3
• ARMING_SKIPCHK of 10 not skipping gyro and accel checks? (discussion) -- misunderstanding
• AP_Mount: fix scripting backend #32382 (PR) -- resolved for 4.7.0-beta3
• Circle mode points mount straight down when doing panorama (discussion) -- user misunderstanding
• Firmware Upload: allow forcing upload even if same as what is already on the board MissionPlanner#3693 -- resolved in MP ahead of 4.7.0-beta3 release
• RC_OPTIONS = 1 (Ignore RC Receiver) is not being respected (discussion, PR) -- resolved for 4.7.0-beta3
• BRD_SAFETY_DFLT = 0 should force BRD_SAFETYOPTION = 0? should update param desc? (discussion) -- working as expected, not new to 4.7
• CubeOrange+ Secure Bootloader breaks USB in release build (-Os), works only with --debug (-Og) #32511 -- could not reproduce, no response from user, created security wiki page and improved secure firmware instructions
• CUAV Pixhawk V3C not detecting IST8310 compass (discussion, PR) -- resolved for 4.7.0-beta3
• EKF3: Position Down snaps to ODOMETRY Z value when ExternalNav is not configured as POSZ source #32506 (PR) -- resolved ahead of 4.7.0-beta3
• Plane: Adjust slope terminology #29087 missing from release notes (discussion) -- @IamPete1 updated the plane 4.7.0-beta1 release notes
• Plane Follow's FOLLP_SIM_TlF_FN should have upper case L (PR) -- resolved for 4.7.0-beta2
• UM982 GPS-for-yaw on CUAV V6X not working (discussion) -- resolved by updating the UM982 firmware
• Copter: Ch6 tuning of WP Speed overshoots during the beginning of the first leg #31584 -- resolved for 4.7.0-beta2
• QGC altitude slider not working (discussion) -- fixed for daily build on 18Mar2026
• QGC takeoff slider not working (discussion) -- fixed in QGC 14148
• QGC Parameters need updating (@rmackay9 and @DonLakeFlyer discussed if dev-team channel, PR) -- fixed in QGC daily on 17-Mar-2026
• EKF's use of rangefinder and baro never switches back to rangefinder after switching to baro (discussion) -- user error
• update PSC_ACCZ_I and PSC_ACCZ_P tuning advice https://ardupilot.org/copter/docs/initial-tuning-flight.html#test-althold (PR) -- wiki updated ahead of 4.7.0-beta2
• SRV_Channel: Slew limit: always allocate even if disabled #32381 -- resolved for 4.7.0-beta2
• ATC_ACC conversion didn't work (discussion). Should we remove the "configured" checks (code). Caused by installing 4.7.0-dev prior to release of beta1
• AP_Camera: fix conversion for runcam #32428 -- resolved for 4.7.0-beta2

[DonLakeFlyer]

QGC should be up to date with Parameters by tomorrow:mavlink/qgroundcontrol#14148

[DonLakeFlyer]

I also verified that the Takeoff slider problem is fixed by the fixes in QGC 14148

[timtuxworth]

In Plane Follow, the parameter FOLLP_SIM_TLF_FN has a lowercase letter L ... "SIM_TlF_FN" which will cause mavproxy.py to fail displaying parameters on Linux.

[Derker2002]

FCU does not route custom dialect commands to components when the ‘MAV2_OPTIONS’ parameter is set to 8. Aka bad CRC packets.

[IamPete1]

FCU does not route custom dialect commands to components when the ‘MAV2_OPTIONS’ parameter is set to 8. Aka bad CRC packets.

@Derker2002 Please open a new issue and provide more details of how we can reproduce.

[timtuxworth]

Regarding the terrain loading issue, I'm fairly sure this is a problem. As far as I can see if I download STRM1 (30m) tiles from terrain.ardupilot.org onto the SD Card, and set TERRAIN_SPACING = 30, AP will ignore the SD card terrain data and download new terrain from the GCS. This is using 4.8 dev, I've also seen it on 4.7 dev (pre beta). I'll try to test this on 4.7 beta as soon as I can.

This is a tlog showing this happening: https://www.dropbox.com/scl/fi/49r4z59hbssz7xe7bosko/2026-04-05-11-48-23.tlog?rlkey=1sx220cu57ih8f50wrcegov4h&dl=0

This is the matching BIN log: https://www.dropbox.com/scl/fi/d1rxpgezvuc8c1lk3fy3b/log_126_2026-4-5-12-11-38.bin?rlkey=v32dug2at4f1requjkq8asjdj&dl=0

This is the terrain data that was in /APM/terrain when this happened: https://www.dropbox.com/scl/fo/afdb9hijyq2qzmdf3bgw1/ABDp4yUB7bp5ND6sSNeMZI0?rlkey=tx6uudh2fmoakk7osethz8kpd&dl=0