# PX4-Autopilot Main Release Notes

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This contains changes to the PX4 `main` branch that are not included in the next release ([PX4 v1.18](../releases/1.18.md)).

::: warning
PX4 v1.18 is in beta testing.
Update these notes with features that are going to be in `main` (PX4 v1.19 or later) but not the PX4 v1.18 release.
:::

## Read Before Upgrading

Please continue reading for [upgrade instructions](#upgrade-guide).

## Major Changes

- TBD

## Upgrade Guide

- `COM_ARM_TRAFF` has been replaced by `COM_TRAFF_AVOID`. The old value 3 ("enforce for mission modes only") is migrated to `COM_TRAFF_AVOID=2`, which blocks arming in all modes, not just mission modes. If you relied on being able to arm manually with traffic detected, set `COM_TRAFF_AVOID=1` (warning only) instead.

## Other changes

- Fast mission Return modes ([RTL_TYPE](../advanced_config/parameter_reference.md#RTL_TYPE) = 2 and 4) now skip `DO_JUMP` commands (loops) while following the mission path. ([PX4-Autopilot#26993: fix(navigator): goToNextPositionItem skip loops when required](https://github.com/PX4/PX4-Autopilot/pull/26993))

### Hardware Support

- TBD

### Common

- TBD

### Control

- TBD

### Safety

- [Geofence Aware Return mode](../flight_modes/return.md#geofence_awareness). ([PX4-Autopilot#27145: feat(navigator): Geofence Aware RTL](https://github.com/PX4/PX4-Autopilot/pull/27145), [PX4-Autopilot#28001: docs(navigator): [geofence] added some more warnings about limitations](https://github.com/PX4/PX4-Autopilot/pull/28001)).

### Estimation

- TBD

### Sensors

- TBD

### Simulation

- TBD

### Debug & Logging

- TBD

### Ethernet

- TBD

### uXRCE-DDS / Zenoh / ROS2

- TBD

### MAVLink

- TBD

### RC

- TBD

### Multi-Rotor

- TBD

### VTOL

- TBD

### Fixed-wing

- TBD

### Rover

- TBD

### ROS 2

- TBD