Glossary
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The following table lists the terms and acronyms used throughout this document:

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**Term/Acronym** **Definition**
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AGL              Above Ground Level
Beidou           Chinese positioning system
EASA             European Union Aviation Safety Agency
EMC              Electromagnetic Compatibility
GALILEO          European positioning system
GLONASS          Russian positioning system
GNSS             Global Navigation Satellite System
GPS              Global Positioning System (American positioning system)
HEIFU®           Hexa External Intelligent Flying Unit
IMU              Inertial Measurement Unit
Lisboa           Line of Sight 
PCB              Printed Circuit Board
QZSS             Japanese positioning system
ROS              Robot Operating System 
RTK              Real Time Kinetic 
SBAS             Satellite Based Augmentation System
UAV              Unmanned Aerial Vehicle
USB              Universal Serial Bus
WEEE             Waste Electrical and Electronic Equipment
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