- [Voltage-based estimation with load compensation](../config/battery.md#voltage-based-estimation-with-load-compensation) now uses a real-time estimate of the internal resistance of the battery to compensate voltage drops under load (with increased current), providing a better capacity estimate than with the raw measured voltage.
- Thrust-based load compensation has been removed (along with the `BATn_V_LOAD_DROP` parameters, where `n` is the battery number).
- The [Position (GNSS) loss failsafe](../config/safety.md#position-gnss-loss-failsafe) configurable delay (`COM_POS_FS_DELAY`) has been removed.
The failsafe will now trigger 1 second after position has been lost. ([PX4-Autopilot#24063](https://github.com/PX4/PX4-Autopilot/pull/24063)).
- [Log Encryption](../dev_log/log_encryption.md) now generates an encrypted log that contains the public-key-encrypted symmetric key that can be used to decrypt it, instead of putting the key into a separate file.
This makes log decryption much easier, as there is no need to download or identify a separate key file.
- The generic mission command timeout [MIS_COMMAND_TOUT](../advanced_config/parameter_reference.md#MIS_COMMAND_TOUT) parameter replaces the delivery-specific `MIS_PD_TO` parameter.
Mission commands that may take some time to complete, such as those for controlling gimbals, winches, and grippers, will progress to the next item when either feedback is received or the timeout expires.
This is often used to provide a minimum delay for hardware that does not provide completion feedback, so that it can reach the commanded state before the mission progresses.
- **[uORB]** Introduce a [version field](../middleware/uorb.md#message-versioning) for a subset of uORB messages ([PX4-Autopilot#23850](https://github.com/PX4/PX4-Autopilot/pull/23850))
- [Compass calibration](../config/compass.md) disables internal compasses if an external compass is available.
This typically reduces false warnings due to magnetometer inconsistencies.
- [PX4-Autopilot#23863](https://github.com/PX4/PX4-Autopilot/pull/23863): [Sponsored by ARK] Bidirectional DShot
- [PX4-Autopilot#24196](https://github.com/PX4/PX4-Autopilot/pull/24196): Make control allocation and actuator effectiveness a non-module-specific library
- [PX4-Autopilot#24221](https://github.com/PX4/PX4-Autopilot/pull/24221): Spacecraft Build and Bare Control Allocator
- Configurable multicopter orbit-mode yaw via `MC_ORBIT_YAW_MOD` ([PX4-Autopilot#23358](https://github.com/PX4/PX4-Autopilot/pull/23358))
- Collision prevention now works in manual (acceleration-based) flight mode (`MPC_POS_MODE`) ([PX4-Autopilot#23507](https://github.com/PX4/PX4-Autopilot/pull/23507))
- [PX4-Autopilot#24316](https://github.com/PX4/PX4-Autopilot/pull/24316): Compass calibration now disables internal compass when external unit present, reducing false warnings
### Simulation
- **SIH**:
- The SIH on SITL [custom takeoff location](../sim_sih/index.md#set-custom-takeoff-location) in now set using the normal unscaled GPS position values, where previously the value needed to be multiplied by 1E7.
- New vehicle model `x500_lidar_2d` — [x500 Quadrotor with 2D Lidar](../sim_gazebo_gz/vehicles.md#x500-quadrotor-with-2d-lidar). ([PX4-Autopilot#22418](https://github.com/PX4/PX4-Autopilot/pull/22418), [PX4-gazebo-models#41](https://github.com/PX4/PX4-gazebo-models/pull/41)).
- New vehicle model `x500_lidar_front` — [X500 Quadrotor with 1D LIDAR (Front-facing)](../sim_gazebo_gz/vehicles.md#x500-quadrotor-with-1d-lidar-front-facing). ([PX4-Autopilot#23879](https://github.com/PX4/PX4-Autopilot/pull/23879), [PX4-gazebo-models#62](https://github.com/PX4/PX4-gazebo-models/pull/62/files)).
- New vehicle model `x500_lidar_down` — [X500 Quadrotor with 1D LIDAR (Down-facing)](../sim_gazebo_gz/vehicles.md#x500-quadrotor-with-1d-lidar-down-facing). ([PX4-Autopilot#23879](https://github.com/PX4/PX4-Autopilot/pull/23879), [PX4-gazebo-models#62](https://github.com/PX4/PX4-gazebo-models/pull/62/files)).
- New vehicle model `r1_rover` — [Aion Robotics R1 Rover](../sim_gazebo_gz/vehicles.md#differential-rover) ([PX4-Autopilot#22402](https://github.com/PX4/PX4-Autopilot/pull/22402) and [PX4-gazebo-models#21](https://github.com/PX4/PX4-gazebo-models/pull/21)).
- New vehicle model `rover_ackermann` — [Ackermann Rover](../sim_gazebo_gz/vehicles.md#ackermann-rover) ([PX4-Autopilot#23383](https://github.com/PX4/PX4-Autopilot/pull/23383) and [PX4-gazebo-models#46](https://github.com/PX4/PX4-gazebo-models/pull/46)).
- New vehicle model `x500_gimbal` — [Quadrotor(x500) with gimbal (Front-facing) in Gazebo](../sim_gazebo_gz/vehicles.md#x500-quadrotor-with-gimbal-front-facing) ([PX4-Autopilot#23382](https://github.com/PX4/PX4-Autopilot/pull/23382) and [PX4-gazebo-models#47](https://github.com/PX4/PX4-gazebo-models/pull/47) and [PX4-gazebo-models#70](https://github.com/PX4/PX4-gazebo-models/pull/70)).
- New vehicle model `quadtailsitter` — [Quad Tailsitter VTOL](../sim_gazebo_gz/vehicles.md#quad-tailsitter-vtol) ([PX4-Autopilot#23943](https://github.com/PX4/PX4-Autopilot/pull/23943) and [PX4-gazebo-models#65](https://github.com/PX4/PX4-gazebo-models/pull/65)).
- New vehicle model `tiltrotor` — [Tiltrotor VTOL](../sim_gazebo_gz/vehicles.md#tiltrotor-vtol) ([PX4-Autopilot#24028](https://github.com/PX4/PX4-Autopilot/pull/24028) and [PX4-gazebo-models#66](https://github.com/PX4/PX4-gazebo-models/pull/66)).
- [Faster than Real-time Simulation](../simulation/index.md#simulation_speed) ([PX4-Autopilot#24421](https://github.com/PX4/PX4-Autopilot/pull/24421), [PX4-Autopilot#23783](https://github.com/PX4/PX4-Autopilot/pull/23783))
- **[Feature]** [PX4-Autopilot#24113](https://github.com/PX4/PX4-Autopilot/pull/24113): <Badge type="warning" text="Experimental"/> [ROS 2 Message Translation Node](../ros2/px4_ros2_msg_translation_node.md) to translate PX4 messages from one definition version to another dynamically
- [PX4-Autopilot#23943](https://github.com/PX4/PX4-Autopilot/pull/23943): Add gz model for quadtailsitter
- [PX4-Autopilot#23358](https://github.com/PX4/PX4-Autopilot/pull/23358): Allow system-default [multicopter orbit mode](../flight_modes_mc/orbit.md) yaw behaviour to be configured, using the parameter [MC_ORBIT_YAW_MOD](../advanced_config/parameter_reference.md#MC_ORBIT_YAW_MOD)
- [PX4-Autopilot#23507](https://github.com/PX4/PX4-Autopilot/pull/23507): Adapted the [Collision Prevention](../computer_vision/collision_prevention.md) implementation to work in the default manual flight mode (Acceleration Based) [MPC_POS_MODE](../advanced_config/parameter_reference.md#MPC_POS_MODE).
- [PX4-Autopilot#23520](https://github.com/PX4/PX4-Autopilot/pull/23520): FixedWing: allow position control without valid global position
- Improvement: Fixed-wing auto takeoff: enable setting takeoff flaps for hand/catapult launch. [PX4-Autopilot#23460](https://github.com/PX4/PX4-Autopilot/pull/23460)
### Rover
This release contains a major rework for the rover support in PX4:
- Complete restructure of the [rover related documentation](../frames_rover/index.md).
- New firmware build specifically for [rovers](../frames_rover/index.md#flashing-the-rover-build).
- New module dedicated to [Ackermann rovers](../frames_rover/ackermann.md):
- The module currently supports [manual mode](../flight_modes_rover/ackermann.md#manual-mode), [acro mode](../flight_modes_rover/ackermann.md#acro-mode), [position mode](../flight_modes_rover/ackermann.md#position-mode) and [auto modes](../flight_modes_rover/ackermann.md#auto-modes).
- New module dedicated to [differential rovers](../frames_rover/differential.md):
- The module currently supports [manual mode](../flight_modes_rover/differential.md#manual-mode), [acro mode](../flight_modes_rover/differential.md#acro-mode), [stabilized mode](../flight_modes_rover/differential.md#stabilized-mode), [position mode](../flight_modes_rover/differential.md#position-mode) and [auto modes](../flight_modes_rover/differential.md#auto-modes).
- New module dedicated to [mecanum rovers](../frames_rover/mecanum.md):
- The module currently supports [manual mode](../flight_modes_rover/mecanum.md#manual-mode), [acro mode](../flight_modes_rover/mecanum.md#acro-mode), [stabilized mode](../flight_modes_rover/mecanum.md#stabilized-mode), [position mode](../flight_modes_rover/mecanum.md#position-mode) and [auto modes](../flight_modes_rover/mecanum.md#auto-modes).
- Added rover-specific firmware build (`50000–52000`) for Ackermann, differential and mecanum rovers
- Restructure of the [rover airframe](../airframes/airframe_reference.md#rover) numbering convention ([PX4-Autopilot#23506](https://github.com/PX4/PX4-Autopilot/pull/23506)).
This also introduces several [new rover airframes](../airframes/airframe_reference.md#rover):
- Generic Differential Rover `50000`.
- Generic Ackermann Rover `51000`.
- Axial SCX10 2 Trail Honcho `51001`.
- Generic Mecanum Rover `52000`.
- Library for the [pure pursuit guidance algorithm](../config_rover/differential.md#pure-pursuit-guidance-logic) that is shared by all the rover modules.
- [Simulation](../frames_rover/index.md#simulation) for differential-steering and Ackermann rovers in gazebo (for release notes see `r1_rover` and `rover_ackermann` in [simulation](#simulation)).
- Deprecation of the [rover position control](../frames_rover/rover_position_control.md) module: Note that the legacy rover module still exists but has been superseded by the new dedicated modules.
### Infrastructure
- [PX4-Autopilot#24011](https://github.com/PX4/PX4-Autopilot/pull/24011): standard_modes: add vehicle-type specific standard modes
- [PX4-Autopilot#24020](https://github.com/PX4/PX4-Autopilot/pull/24020): ci: build all upload to releases
A list of PX4 release notes, they contain a list of the changes that went into each release, explaining the included features, bug fixes, deprecations and updates in detail.
- [main](../releases/main.md) (changes since v1.15)
- [main](../releases/main.md) (changes since v1.16)
- [v1.16](../releases/1.16.md)
- [v1.15](../releases/1.15.md)
- [v1.14](../releases/1.14.md)
- [v1.13](../releases/1.13.md)
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