UAV Terminology – Core Terms
This page is intended as a knowledge base for self-study.
For those working in or entering a career in unmanned aerial vehicles (UAVs/Drones).
The main goal is not to memorize vocabulary.
But it is about understanding the internationally standardized language actually used in flight operations.
All vocabulary was selected and grouped based on real-world usage contexts.
It covers aircraft structure, control systems, navigation, and safety.
Flight operations and legal regulatory framework.
The purpose of this page
Preparing students for enrollment in courses or training by providing them with a foundation in...
Developing Operational Understanding
The focus is on terminology actually used in aviation, not theoretical definitions.
Situational thinking skills
Safety attitude
Knowledge
Laying the foundation for exams and assessments.
A number of the terms used are linked to the types of questions and situations commonly encountered in the licensing exam.
The main concept of content organization.
The terminology on this page is grouped according to the operating systems of drones.
Not arranged alphabetically, to reflect the mindset of actual practitioners.
Students will gradually gain an overview of the UAV system from the beginning.
Aircraft → Control System → Navigation → Safety → Regulations → Risk Assessment
This concept is consistent with both...
Professional training
International standard examination structure
Fieldwork
Long-term goals
What this page aims to create is not just "those who passed the exam."
But it's the culture of safety in using drones in Thailand that matters.
When users understand the terminology correctly.
Decision making, communication, and flight operations.
It will be based on responsibility and mutual understanding.
And the same standards as international levels.
Vocabulary Group: Aircraft & Components
(Aircraft structure and drone components)
Unmanned Aircraft (UA)
An aircraft without a pilot on board.
This refers to the aircraft itself, excluding the operators or ground systems.
[Exam Focus] — Often used in legal definitions and CAAT exams.
Unmanned Aircraft System (UAS)
A complete unmanned aerial vehicle system.
It consists of the drone itself, a ground control system, a communication system, and supporting equipment.
[Exam Focus] — The exam often asks about the difference between UA and UAS.
Drone
A general term for unmanned aerial vehicles (UAVs).
Used in colloquial language and marketing.
In legal terms, the term "Unmanned Aircraft" is often used instead.
[Exam Focus] — Be careful not to confuse legal terms with general terms.
Airframe
The main structure of the drone.
Includes the body, arms, propeller, and support frame.
It has a direct impact on strength, weight, and flight stability.
Propeller
The propeller blades are responsible for creating lift and thrust.
Size, shape, and direction of rotation affect flight performance. [Exam Focus]
Related to safety and maintenance.
Arm
The drone's arm frame that holds the motors and propellers.
It affects propeller spacing, stability, and weight distribution.
[Exam Focus] — Found in questions related to the structure and strength of aircraft.
Landing Gear
Drone take-off and landing support structure.
Helps to reduce impact and prevent damage to the equipment.
It affects landing safety and maintenance.
Motor
Electric motor that drives the propeller.
The number and power of the motors are related to the weight and performance of the drone.
Motor malfunctions are a common cause of accidents.
Electronic Speed Controller (ESC)
Motor speed control device
Receive commands from the flight control system to adjust thrust.
A malfunction could cause the drone to lose control immediately.
Flight Controller
The drone's main brain.
It processes data from sensors and controls flight.
[Exam Focus] — The exam often asks about the role of this system in terms of security.
Battery
Drone power source
Battery capacity and condition affect flight time and safety.
[Exam Focus] — Related to flight restrictions and safety risks.
Payload
Additional payload weight from the drone.
For example, cameras, sensors, or specialized equipment.
It affects performance, flight duration, and legal requirements.
Maximum Takeoff Weight (MTOW)
The maximum weight a drone can safely fly.
Assemble the drone, battery, and payload.
[Exam Focus] — Used to define drone types and related regulations.
This vocabulary is fundamental.
For an understanding of the legal aspects and classification of drones.
And answering exam questions directly related to "the aircraft itself."
Vocabulary Group:
Control & Communication Systems
Remote Controller (RC)
The equipment used by the operator to control the drone from the ground.
Used to control direction, speed, and flight mode.
[Exam Focus] — A common question is about the difference between RC (Remote Control) and automatic control systems.
Ground Control Station (GCS)
The ground control system could be a remote, tablet, or computer.
Used to display flight information, maps, and drone status.
[Exam Focus] — Linked to BVLOS flight control.
Command & Control (C2)
The process of sending control commands from the operator to the drone.
It encompasses both control signals and aircraft responses.
[Exam Focus] — Used in the context of safety and flight restrictions.
Control Link
Communication channels used to send flight control commands.
If the Control Link signal is lost, the system will enter Fail-safe mode.
[Exam Focus] — Directly related to the Lost Link Procedure.
Telemetry
Status information sent back to the controller by the drone.
For example, position, altitude, speed, and battery level.
Used for decision-making and safety in aviation.
Fail-safe System
The system protects against malfunctions such as signal loss or low battery.
The drone can be instructed to hover, return to its starting point, or land.
[Exam Focus] — Frequently tested in situational question format.
Antenna
Radio transceiver for communication between the drone and the control system.
The characteristics, location, and installation of the antenna affect signal quality and control range.
[Exam Focus] — Related to Control Link Quality and Lost Link Issues.
Link Quality
The stability and quality of communication between the drone and the operator.
It is usually evaluated based on signal strength, latency, and data loss rate.
[Exam Focus] — Used to analyze the causes of communication loss or entering a fail-safe state.
Data Link
A channel for receiving and sending information other than flight control commands.
For example, images, videos, or data from sensors.
Separate from Control Link but works together within a UAS system.
[Exam Focus] — Exam questions often compare to Control Link.
Communication Frequency
The frequency range used for controlling and communicating with drones.
It must comply with the requirements of the NBTC (National Broadcasting and Telecommunications Commission) regarding both frequency band and transmission power.
This has a direct impact on device registration and legal compliance.
[Exam Focus] — Related to spectrum laws and remote registration.
Transmit Power (TX Power)
Transmitting power is the level of energy that the control device or drone uses to transmit a signal.
Higher transmission power increases communication range, but it must not exceed legal limits.
According to the NBTC (National Broadcasting and Telecommunications Commission) regulations, the maximum EIRP (Earth Ignition Power Rating) varies by frequency band, for example:
• 433 MHz band, maximum transmit power 10 mW
• 2,400–2,500 MHz (2.4 GHz) band, maximum transmit power 100 mW
• 5,725–5,850 MHz (5.8 GHz) band, maximum transmit power 1,000 mW
Using equipment with transmission power exceeding the specified limit is illegal, even if it can actually fly.
[Exam Focus] — Exam questions often focus on "selecting the legally correct value" or "cases of using the wrong band/power range."
Signal Interference
Interference from other sources.
This may cause unstable control, image loss, or loss of communication.
This is a common risk in urban and densely populated areas.
Lost Link
A situation where the drone is unable to communicate with the operator.
The system will enter Fail-safe mode according to the preset value.
For example, hovering, returning to the starting point, or gliding down.
[Exam Focus] — Situational questions are frequently tested.
Return-to-Home (RTH)
Automatic mode that allows the drone to fly back to its starting point.
It usually operates when there is a lost link or low battery.
The operator must understand the operating conditions and limitations of the system.
[Exam Focus] — RTH will not function perfectly in all cases.
Vocabulary: Navigation & Positioning Systems
(Drone navigation and positioning system)
GNSS (Global Navigation Satellite System)
A satellite navigation system used to determine position, speed, and time.
It is a composite structure of several systems, such as GPS, GLONASS, and Galileo.
[Exam Focus] — It's used more as a general term in technical and legal contexts than simply "GPS."
GPS (Global Positioning System)
United States satellite positioning system
Drones use GPS data for location, navigation, and automated operations.
[Exam Focus] — Exams typically focus on the accuracy and limitations of signals.
Position Hold
A mode that allows the drone to automatically hover in place.
It relies on location data from GNSS and additional sensors.
It affects the stability and safety of flight.
Home Point
The reference position recorded by the drone serves as the starting point of the flight.
It is used as a target in the operation of the Return-to-Home (RTH) system.
[Exam Focus] — It's important to understand when the rules are set and whether they can be changed.
Waypoint Navigation
Flying according to predetermined coordinates.
Used in surveying, mapping, and aerial photography.
[Exam Focus] — Related to automated controls and legal restrictions.
Geolocation
The drone geolocation process.
Based on data from GNSS and position processing.
It plays a role in monitoring and enforcing the law.
Compass (Magnetometer)
A sensor used to detect the direction of the Earth's magnetic field.
It helps the drone know its own orientation.
[Exam Focus] — Magnetic interference may cause Compass Error.
IMU (Inertial Measurement Unit)
A set of sensors that measure motion, rotation, and acceleration.
Works in conjunction with GNSS to control flight stability.
It is a basic safety system for drones.
RTK (Real-Time Kinematic)
Technology that enhances position accuracy using real-time GNSS.
Use correction signals from ground reference stations.
[Exam Focus] — Used in surveying and other applications requiring exceptionally high precision.
SBAS (Satellite-Based Augmentation System)
GNSS (Global Navigation Satellite System) accuracy enhancement system.
Please correct the positional error.
Used in aviation systems and advanced navigation applications.
HDOP (Horizontal Dilution of Precision)
Values used to evaluate the accuracy of horizontal positioning.
A lower value indicates a higher level of reliability for the GNSS signal.
[Exam Focus] — Used to assess the stability of location data.
Geofencing
Virtual flight area delimitation system
When the drone approaches or leaves the designated area, the system will automatically limit or warn you.
[Exam Focus] — Related to flight area restrictions and aviation regulations.
Altitude Reference
The reference altitude used to calculate the drone's elevation may be based on sea level, ground level, or the starting point of the flight.
This affects compliance with legal height restrictions.
Barometer
Air pressure sensors are used to calculate altitude.
Works in conjunction with GNSS to enhance altitude stabilization.
[Exam Focus] — Inaccuracies may occur due to weather conditions.
Vision Positioning System (VPS)
A positioning system that uses cameras and image sensors.
Helps maintain position when GNSS signals are weak or unstable.
Frequently used in indoor areas or at low elevations.
Visual Odometry
Techniques for calculating the position and movement of a drone from images captured by a camera.
It is used to analyze changes in the image between frames to help maintain position when the GNSS signal is weak or lost.
[Exam Focus] — Works in conjunction with a Vision Positioning System (VPS).
Relative Positioning
Determining the position of a drone relative to surrounding objects or surfaces.
It doesn't directly reference global coordinates, but uses data from sensors and cameras.
[Exam Focus] — Use in indoor environments or areas with unstable GNSS.
Vocabulary Group: Safety & Flight Operation Modes
(Safety systems and flight operating modes)
(of the drone)
Fail-safe System
A safety system designed to respond when abnormal conditions occur during flight, such as signal loss, low battery, or system malfunction. The drone will automatically execute a predefined behavior, such as hovering, returning to the home point, or landing.
[Exam Focus] — Frequently tested through situational questions.
Return-to-Home (RTH)
An automatic function that commands the drone to return to its designated Home Point. It is typically triggered by lost signal (Lost Link), low battery, or manual activation by the operator.
[Exam Focus] — Understanding the activation conditions and operational limitations is important, not just the definition.
Emergency Landing
A flight mode or procedure used when the drone can no longer continue flying safely. This may occur due to system malfunction, insufficient power, or unsuitable environmental conditions. The objective is to reduce risks to people and property on the ground.
Geo-fencing
A virtual boundary system that restricts drones from entering prohibited or restricted airspace.
[Exam Focus] — Often linked to legal restrictions and controlled airspace.
Low Battery Warning
A warning system that alerts the operator when the battery level drops below a defined threshold, allowing sufficient time to return or safely end the flight.
[Exam Focus] — Related to operational safety and risk management.
Obstacle Avoidance
A system that automatically detects and avoids obstacles using multiple sensors. However, it cannot fully replace the responsibility of the remote pilot.
Manual Mode
A flight mode in which the pilot must control direction and altitude entirely without assistance from advanced stabilization or positioning systems.
[Exam Focus] — Often compared with assisted or automated flight modes.
Attitude Mode (ATTI)
A flight mode that stabilizes the drone’s attitude but does not hold its position. Without pilot input, the drone may drift with the wind.
[Exam Focus] — Related to pilot skill and operational safety risks.
Failsafe Trigger
A condition or mechanism that activates the Fail-safe system, such as signal loss, low battery, or internal system error.
[Exam Focus] — Exam questions often link the triggering event with the drone’s automatic response.
Critical Battery Level
A battery level at which the system forces the drone to land or terminate the mission automatically to prevent loss of control or a crash.
[Exam Focus] — Different from Low Battery Warning, which only alerts the operator rather than forcing immediate action.
Lost Link
A situation where the drone is unable to communicate with the operator.
The system will enter a configured fail-safe state, such as RTH (Right to Return) or landing.
[Exam Focus] — This type of question is frequently tested in situational format.
Signal Fail-safe
Configuring the drone's behavior when control or communication signals are lost.
The operator must set the parameters in advance before taking flight.
This is directly related to aviation safety.
Return Altitude
The altitude the drone will climb before returning to Home Point in RTH mode.
Use to avoid obstacles along the way.
[Exam Focus] — This is often tested together with RTH and Home Point.
Emergency Stop
The command stops the motor immediately.
Use only in emergencies, as it may cause the drone to crash immediately.
Related to risks to individuals and property.
Auto-landing
A mode where the system instructs the drone to land automatically.
It usually activates when the battery is very low or when a risk warning system is activated.
The operator must understand the operating conditions of the system.
Flight Mode
Flight control patterns that determine the behavior of drones.
For example, Manual, ATTI, GPS Mode.
[Exam Focus] — Used to test understanding of the role of a drone operator.
GPS Mode
A flight mode that uses location data from GNSS.
Helps maintain the position and stability of the drone.
Commonly used in routine flight and basic training.
Safety Function
Safety functions designed to reduce the risks involved in aviation.
Examples include Fail-safe, RTH, and Obstacle Avoidance.
[Exam Focus] — Frequently asked questions concern the overall drone safety system.
Vocabulary Group: Regulations & Operational Compliance
(Regulatory agency)
CAAT (Civil Aviation Authority of Thailand)
The civil aviation regulatory authority of Thailand.
It has the authority to issue regulations, permit, and control drone flights.
[Exam Focus] — Aviation and Flight Operations Regulatory Agencies
CAAT UAS Portal (Web & Mobile Application)
The CAAT central system for managing unmanned aerial vehicle (UAV) operators and aircraft.
This covers registration, knowledge testing, and certification in accordance with the law.
-
It can be accessed via a website (web portal) and a mobile application (mobile app).
-
This is the only official channel of CAAT.
Scope of the system's functions
-
Pilot Registration & Knowledge Examination
-
Drone Registration (Reference for Aircraft)
-
Certificate Issuance (valid for 2 years)
-
Flight-related Compliance Record
[Exam Focus] — CAAT UAS Portal = Central hub for aviation regulation, not import regulation.
Operator
The operator or person responsible for the use of unmanned aerial vehicles.
Applicants must meet the qualifications and be registered with CAAT.
Registration (CAAT)
Registration of pilots and aircraft with the aviation authority.
It is a basic requirement prior to legally permitted flight operations.
Authorization / Operational Approval
Permission is granted on a case-by-case basis for high-risk flights.
For example, controlled areas or special flight patterns.
NBTC (National Broadcasting and Telecommunications Commission)
Thailand's Broadcasting and Telecommunications Regulatory Authority
They have the legal authority to control the possession and use of devices that transmit radio signals.
[Exam Focus] — Regulatory bodies over frequency spectrum, ownership, and importation.
NBTC Online Registration System
The NBTC's online system for registering communication equipment and drones.
This is the official channel for reporting ownership of equipment that uses radio frequencies.
Scope of responsibilities
-
Registration of Radio-equipped UAV
-
Control of Communication Frequency & TX Power
-
Importation & Possession Compliance
Legal Possession
(By law)
Ownership of a drone requires proof of the device's valid origin.
This includes customs documents and aircraft identification information.
Customs Clearance
Drones imported from foreign countries must go through the correct customs procedures.
Failure to declare or notify of an import in advance constitutes illegal importation.
Illegal Importation
Bringing drones into the country without going through customs or without notifying the NBTC in advance.
This has a direct impact on the ability to register and use the service.
[Exam Focus] — Import status affects eligibility for NBTC registration.
NBTC Registration Validity
-
Thai nationals: Registration is for life.
-
Foreign nationals: The registration period is tied to their residency status in the country.
CAAT controls "aviation," while NBTC controls "possession and communications."
Proper drone registration requires approval from two different agencies, each with its own legal scope.
Vocabulary Group: Flight Environment & Risk Awareness
(Aviation environment and risk assessment)
Weather Limitation
Weather limitations that affect drone flight safety include strong winds, rain, fog, or low visibility.
Flying in weather conditions that exceed the limits of the aircraft or the operator may increase the risk of losing control.
Wind Shear
Sudden, short-term changes in wind speed or direction.
This may cause the drone to lose stability, especially during takeoff and landing, or when flying near buildings.
Magnetic Interference
Magnetic field interference from metal structures, transmission towers, or electrical power sources.
This affects the functioning of the compass and navigation system.
Urban Environment
An urban environment with tall buildings, noise pollution, and high population density.
Increases communication, navigation, and security risks to external parties.
Population Density
Population density in the flight area.
It is a key factor in assessing risk and considering flight restrictions or permits.
Night Operation
Flying at night or in low visibility conditions.
This requires a proper signaling system and the skill of the operator, and may be subject to legal restrictions.
Operational Risk Assessment
The process of assessing risks before and during flight.
Consideration should be given to weather conditions, flight paths, external personnel, and aircraft readiness.
Go/No-Go Decision
The decision to allow or cancel flights.
Based on environmental conditions, risks, and technical or legal limitations.
Environmental Limitation
Environmental limitations that affect aviation include wind, visibility, and obstructions.
It is a contributing factor in determining the conditions for permitting or terminating flights.
Situational Awareness
The ability of a pilot to perceive and understand their surroundings while flying.
It has a direct impact on safety, especially in complex areas or with low visibility.
Human Factor
Human factors such as fatigue, decision-making, and operator experience.
This could be the cause of the error, even if the environment is within normal limits.
Operational Limitation
The scope of operations as defined by aircraft laws or regulations.
For example, time, area, altitude, or environmental conditions that permit flight.
Flight Suspension
Suspending or canceling a flight mission when the risk becomes unacceptable.
Used to prevent accidents and damage to persons or property.
Next vocabulary word:
UAV Vocabulary – Exam & Operations
After understanding the basic terminology,
The content on the next page will use these terms in the context of...
Examinations and assessments of knowledge.
Real-world flight scenarios (Operational Scenarios)
Safety and legal decisions.
The role and responsibilities of an aircraft controller.
The question about a term isn't simply "what does it mean?"
But it will be used to test situational understanding and operational readiness for flight.