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docs/development/Hardware In The Loop (HITL) plugin for X-Plane.md

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+# Hardware In The Loop (HITL) plugin for X-Plane 11/12
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+**Hardware-in-the-loop (HITL) simulation**, is a technique that is used in the development and testing of complex real-time embedded systems. 
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+**X-Plane** is a flight simulation engine series developed and published by Laminar Research https://www.x-plane.com/
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+**INAV-X-Plane-HITL** is plugin for **X-Plane** for testing and developing flight controllers with **INAV flight controller firmware** 
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+https://github.com/RomanLut/INAV-X-Plane-HITL
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+or for latest HITL features (INAV >= 9.0)
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+ **INAV-X-Plane-XITL** 
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+ https://github.com/Scavanger/INAV-X-Plane-XITL
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+HITL technique can be used to test features during development. Please check page above for installation instructions.