GCS

Ground Control Station. This is the computer system that is connected to the aircraft via a telemetry link, and allows the operator to control the aircraft.

GPS

Global Position System. A US based GNSS system that provides geo-spatial positioning. Typically used interchangably with GNSS.

GNSS

Global Navigation Satellite System. A system that uses satellites to provide autonomous geo-spatial positioning. Typically used interchangably with GPS.

IMU

Inertial Measurement Unit. This measures the vehicles orientation, and velocity.

LOS

Line Of Sight. This refers to a straight line along which you have unobstructed vision.

PPK

Post Processed Kinematic. This is a technique used with GPS data to greatly improve the accuracy of logged GPS data.

RC

Remote Control. This refers to the RC controller that allows the safety pilot to manually fly the aircraft, as well as select flight modes.

TLOG

Telemetry Log. A log file of the telemetry data sent and recieved from the aircraft.

VTOL

Vertical Take Off and Landing. An aircraft that can hover, takeoff and land vertically.

Weathervane

When in vertical flight the aircraft slowly turns the nose into the wind. This reduces the work the vertical motors have to do.