İndicator- something which shows information Descend

Warning- notice of possible danger

Sattelite navigation- a system of navigation which uses orbiting satellites to determine the position of an aircraft or point, in relation to the Earth’s surface.

GPS- The system provides highly accurate position and precise time

GLONASS- The system provides highly accurate position and precise time

Reliability- dependability

Multiply- to work out a specified number of times the value of a number

Broadcast- to transmit, often to a large number of people, a radio signal or message which requires no answer

Laser gyroscope- an instrument that uses beams of laser light in a closed circuit to detect whether something is level or not

Segment- A part of a figure

Airborne installation- a radio device in an aircraft which operates in conjunction with a ground installation

Receiver- that receives incoming radio signals and converts them to sound or light