AUTOMATED MUTUAL-ASSISTANCE VESSEL RESCUE SYSTEM- A facility which can deliver, in a matter of minutes, a surface picture (SURPIC) of vessels in the area of a potential or actual search and rescue incident, including their predicted positions and their characteristics. 

(See FAA Order JO 7110.65, Para 10-6-4, INFLIGHT CONTINGENCIES.) 

AUTOMATED PROBLEM DETECTION (APD)- An Automation Processing capability that compares trajectories in order to predict conflicts. 

AUTOMATED PROBLEM DETECTION BOUNDARY (APB)- The adapted distance beyond a facilities boundary defining the airspace within which EDST performs conflict detection. 

(See EN ROUTE DECISION SUPPORT TOOL.) 

AUTOMATED PROBLEM DETECTION INHIB- ITED AREA (APDIA)- Airspace surrounding a terminal area within which APD is inhibited for all flights within that airspace. 

AUTOMATED WEATHER SYSTEM- Any of the automated weather sensor platforms that collect weather data at airports and disseminate the weather information via radio and/or landline. The systems currently consist of the Automated Surface Observ- ing System (ASOS) and Automated Weather Observation System (AWOS). 

AUTOMATED UNICOM- Provides completely automated weather, radio check capability and airport advisory information on an Automated UNICOM system. These systems offer a variety of features, typically selectable by microphone clicks, on the UNICOM frequency. Availability will be published in the Chart Supplement U.S. and approach charts. 

## AUTOMATIC ALTITUDE REPORT- 

(See ALTITUDE READOUT.) 

AUTOMATIC ALTITUDE REPORTING- That function of a transponder which responds to Mode C interrogations by transmitting the aircraft's altitude in 100-foot increments. 

AUTOMATIC CARRIER LANDING SYSTEM- U.S. Navy final approach equipment consisting of precision tracking radar coupled to a computer data link to provide continuous information to the aircraft, monitoring capability to the pilot, and a backup approach system. 

AUTOMATIC DEPENDENT SURVEILLANCE (ADS) [ICAO]- A surveillance technique in which aircraft automatically provide, via a data link, data derived from on-board navigation and position fixing systems, including aircraft identification, four dimensional position and additional data as appropriate. 

AUTOMATIC DEPENDENT SURVEILLANCE- BROADCAST (ADS-B)- A surveillance system in which an aircraft or vehicle to be detected is fitted with cooperative equipment in the form of a data link transmitter. The aircraft or vehicle periodically broadcasts its GNSS-derived position and other required information such as identity and velocity, which is then received by a ground-based or space-based receiver for processing and display at an air traffic control facility, as well as by suitably equipped aircraft. 

(See AUTOMATIC DEPENDENT SURVEILLANCE-BROADCAST IN.) 

(See AUTOMATIC DEPENDENT SURVEILLANCE-BROADCAST OUT.) 

(See COOPERATIVE SURVEILLANCE.) 

(See GLOBAL POSITIONING SYSTEM.) 

(See SPACE-BASED ADS-B.) 

AUTOMATIC DEPENDENT SURVEILLANCE- BROADCAST IN (ADS-B In)- Aircraft avionics capable of receiving ADS-B Out transmissions directly from other aircraft, as well as traffic or weather information transmitted from ground stations. 

(See AUTOMATIC DEPENDENT SURVEILLANCE-BROADCAST OUT.) 

(See AUTOMATIC DEPENDENT SURVEILLANCE-REBROADCAST.) 

(See FLIGHT INFORMATION SERVICE-BROADCAST.) 

(See TRAFFIC INFORMATION SERVICE-BROADCAST.) 

AUTOMATIC DEPENDENT SURVEILLANCE- BROADCAST OUT (ADS-B Out)- The transmitter onboard an aircraft or ground vehicle that periodically broadcasts its GNSS-derived position along with other required information, such as identity, altitude, and velocity. 

(See AUTOMATIC DEPENDENT SURVEILLANCE-BROADCAST.) 

(See AUTOMATIC DEPENDENT SURVEILLANCE-BROADCAST IN.) 

