Understand what the specification sheet promises, what it leaves out and which terms affect your first flight.
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Understand the feature, then check the limits
Drone terminology describes different parts of a system: how the aircraft moves, locates itself, communicates and records images. GPS does not mean obstacle avoidance, FPV does not mean autonomous flight, and “ready to fly” does not remove setup. Use the glossary to turn a feature list into practical questions.
This glossary is organized by the decisions a new pilot makes, rather than a long alphabetical list. Definitions explain the term, then the limitation or buying question that usually matters. For a step-by-step first session, use our separate beginner’s flying guide.
Controls and movement
| Term | Plain-English meaning | Useful distinction |
|---|---|---|
| Pitch | Tilt nose forward or backward | Not the same as rotating the camera gimbal |
| Roll | Tilt left or right | Not yaw |
| Yaw | Rotate the aircraft’s heading | The nose turns left or right |
| Throttle | Command related to motor thrust or vertical movement | Stick behavior depends on flight mode |
| Mode 2 | A common transmitter stick layout | Confirm your controller’s layout before flight |
In a common Mode 2 layout, the left stick combines throttle/vertical control with yaw, while the right controls pitch and roll. Do not assume every transmitter is configured this way. A simulator or the manufacturer’s controller diagram lets you learn the mapping without putting an aircraft in the air.
For the hardware behind those commands, see drone transmitters and flight controllers. A flight controller is the onboard computer; the handheld controller is a separate device.
Navigation, hovering and flight modes
- GNSS: Global Navigation Satellite System, the general category of satellite-positioning systems. GPS is one system within it; GLONASS and Galileo are others.
- Home Point: The location recorded for a return function. It is not necessarily your current phone position.
- RTH / RTL: Return to home or return to launch. The route, height, trigger and final landing depend on the system.
- Altitude hold: Assistance maintaining height. It does not by itself stop sideways drift.
- Position hold / loiter: Assistance holding a location as well as height when the required navigation information is available.
- Optical flow / vision positioning: Cameras estimate movement relative to visible surfaces. Performance depends on light, texture and the system’s limits.
- IMU: Inertial measurement unit, using sensors such as accelerometers and gyroscopes to help estimate movement and attitude.
- Compass: A magnetic-heading sensor, not a substitute for satellite positioning.
- Headless mode: Direction commands use a reference heading rather than simply the nose direction. It is not obstacle avoidance or a geographic return system.
Mode names are not universal. ArduPilot’s Copter mode documentation distinguishes stabilization, altitude and position assistance for that autopilot. Read your own aircraft’s manual before transferring a behavior from another system. Our RTH setup guide explains the Home Point checks.
Radio, FPV and link quality
- RC, TX and RX: Radio control, transmitter and receiver. The aircraft’s receiver must understand the transmitter’s system.
- FPV: First-person view, a live image from the aircraft shown on a screen or goggles. FPV describes the view, not the airframe type.
- VTX: Video transmitter. On many FPV systems it is separate from the control receiver.
- Telemetry: Status information such as voltage or link quality sent back to the pilot.
- Latency: Delay between an event and its displayed or acted-on result. A high-resolution video feed is not necessarily a low-delay feed.
- GHz / MHz: Frequency units. A frequency alone does not establish protocol compatibility.
- ELRS: ExpressLRS, an open-source radio-control system. Match supported hardware, band, firmware and settings.
- Failsafe: Configured behavior when a required signal or condition fails. It may not mean return to home.
ExpressLRS hardware guidance explains why choosing the right radio system and band matters. A 2.4 GHz label on two products does not prove they will bind. Check video compatibility separately from radio-control compatibility.
RTF, BNF, PNP and ARF: what is actually in the box?
| Label | Usual meaning | Check before ordering |
|---|---|---|
| RTF: ready to fly | Sold as a relatively complete kit | Battery, charger, controller, setup and registration |
| BNF: bind and fly | Aircraft intended to bind with a compatible radio | Receiver version and your transmitter protocol |
| PNP: plug and play | Typically supplied without a receiver | Exactly which electronics are missing |
| ARF: almost ready to fly | Some assembly or equipment remains | Build steps, parts and tools |
These are packaging descriptions, not uniform guarantees. A useful shopping list has four separate columns: aircraft, control link, video link and power/charging. Mark what the listing includes in each column. An attractive BNF price can be misleading if you still need goggles, a radio, batteries and a charger.
Camera, airframe and motor terms
- Gimbal: A mechanism that stabilizes or points a camera. A three-axis mechanical gimbal compensates on pitch, roll and yaw; electronic image stabilization is different.
- 4K / 1080p: Video resolution labels. Check frame rate, recording mode and whether the specification refers to saved footage or just a live feed.
- FPS: Frames per second. It describes sampling over time, not overall image quality.
- Bitrate: Data recorded per second. It affects compression but does not independently prove sharpness or color quality.
- RAW: A photo format retaining more processing flexibility than a finished JPEG; it still needs appropriate exposure and editing.
- Payload: Equipment carried by the aircraft. Added weight affects the actual takeoff mass and performance.
- Brushless motor: A motor without the brush contact arrangement of a brushed motor. It does not alone guarantee stable flight.
- ESC: Electronic speed controller, which manages power sent to a motor.
- Quadcopter / hexacopter / octocopter: Aircraft with four, six or eight rotors, respectively. Rotor count alone does not establish redundancy.
Compare how the terms play out in the Spark’s 1080p camera, the original Mavic Pro’s 4K camera and the Phantom 4 Advanced’s mechanical-shutter setup. They describe different capabilities, not simply successive quality labels.
Battery units that affect buying and travel
LiPo means lithium-polymer; mAh measures charge capacity, while Wh measures energy and includes voltage. 3S describes three cells connected in series. Match the battery type, cell count, connector and manufacturer requirements; physical fit is not proof of electrical compatibility.
Example: 2,000 mAh is 2 Ah. At 11.1 V that is 22.2 Wh; at 14.8 V it is 29.6 Wh. Equal mAh does not mean equal energy or an interchangeable pack. The examples explain the units, not a charging prescription.
For airline packing and limits, use our drone air-travel checklist and FAA battery guidance. Never charge or fly a swollen or damaged battery.
Airspace and regulatory terms
- UAS / sUAS: Unmanned aircraft system / small unmanned aircraft system. The system includes more than the aircraft alone.
- UAV: Unmanned aerial vehicle, referring to the aircraft.
- VLOS: Visual line of sight. Watching a camera feed is not the same as directly observing the aircraft.
- AGL / MSL: Above ground level / mean sea level. Neither is automatically the same as a displayed height relative to takeoff.
- Remote ID: Broadcast identification under applicable rules. It is not GPS tracking for the owner and is not RTH.
- Geofencing / GEO warning: Manufacturer software guidance or restrictions. The absence of a warning is not legal flight permission.
- TRUST / Part 107: Different U.S. recreational and certificated-pilot frameworks. The purpose and conditions of the flight matter.
Check FAA recreational guidance and the FAA’s Remote ID explanation for current U.S. requirements. Our FAA rules overview connects those requirements to practical flight planning.
Turn a specification into four checks
Suppose a listing says “GPS, 4K, brushless, BNF.” That does not tell you whether it avoids obstacles, has a mechanical gimbal, includes a transmitter or provides a compatible video feed. Ask for those four answers separately before buying.
Then learn how the drone’s components work together and choose a kit around the task you want to perform. Understanding the missing information is more useful than memorizing every acronym.
About this update: Substantively revised September 15, 2026 using the primary sources linked above. Manufacturer specifications are not new test results. Recheck applicable rules, support status and seller details before acting.
