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INAV is a Free and Open Source Flight Controller and Autopilot Software System that is actively developed with feature releases every 4-8 months. INAV has two primary components, the firmware that runs on the flight controller board, and the GUI configuration tool that runs on your PC. Some INAV features include:

Support for a large variety and quantity of inexpensive flight controller (FC) boards and sensors. Many FC's are built specifically for INAV with board layouts intended for easy connection of motors, sensors, servos, etc. intended for use in RC vehicles.
Support for a wide variety of flying vehicles including airplanes, gliders, multi-rotors, quadcopters, etc. as well as ground vehicles (cars, tanks) and water vehicles (boats).
Support for Auto Navigation Modes such as RTH (return to home), position hold, waypoints, "follow-me", and many more.
Support for video transmission & receive systems for FPV (first person view) with On-Screen Display (OSD) of telemetry data.
Use of flight controller (FC) boards based on the F405, F722, & H743 chips are most likely for support of all current and future features of INAV.
Go to the INAV Welcome Page for a longer list of features.

Using the wiki

The right sidebar lists Wiki Pages and DevDocs grouped under Topic Headings.
Search using Github Wiki Search which applies a wikis filter to github search. Unfortunately, the wiki is no longer indexed by the major search engines.

Getting Started

See the sidebar to the right and look at the wiki pages under INTRODUCTION and QUICK START GUIDES
When buying a flight controller board, INAV support is usually listed in the product's description.
To connect and configure INAV on a flight controller, use the INAV Configurator.
If you have experience with BetaFlight, see the wiki page INAV for BetaFlight users to get started.
See our YouTube video guides for some of the many great tutorials on YouTube. YouTube has hundreds and hundreds of great guides on all features of INAV.
Find and Join an INAV user group on your social media platform of choice. INAV users are happy to help get you started.