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Local Area Augmentation A local area augmentation is defined as providing additional satellite signals locally in order to enhance the integrity and/or availability and/or accuracy of the GNSS service. A local area data link is required to carry the augmentation services to a user. Local Area Differential GNSS Local Area Differential GNSS is differential GNSS in which the differential corrections are usable for the supported phases of operation within a limited geographical area. Local Area Network A network connecting various data communication devices in a localised geographical area such as a single aircraft, office building or a group of buildings. Local Convergence and Implementation Programme Objective Application of a CIP Objective to a particular ATC unit or area (or group of ATC units or areas) or to a State (or a group of States). Local Target Date Planned date for the completion of a given local action; only included in CIP for monitoring purposes. Local Track Track created by the mono-radar tracking at the level of a radar station. Localiser The azimuth guidance portion of an instrument landing system. Location Indicator A 4-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the location of an aeronautical fixed station. Logical Acknowledgement Provides confirmation from a receiving system that the message has been successfully received and is operationally acceptable for further processing and eventual display to the appropriate person. Logical Acknowledgement Message The positive logical response message used for ground/ground data communications, as defined within the Eurocontrol Standard for On-Line Data Interchange (OLDI). Logical Architecture The logical architecture is needed to visualise, specify and document the decisions about the vocabulary of the domain and the structural and behavioural way those objects in the domain collaborate. Logical Response A Logical response is notified by the receiving system to the originator or an information flow, in order to notify the originator whether the operational content of the received information is acceptable or unacceptable for further processing and/or presentation to the operator. The Logical Response does not replace any required Operational Response. There are two types of Logical Response: Logical Acknowledgement and Error response. Logical Response time-out The Logical Response Time-out represented as (tr) in the Time Sequence Diagrams, is the maximum end-to-end time allowed from the moment the triggering event is issued from the originator user process and the moment the Logical Response is received by the originator user process. It therefore includes: the technical data extraction and composition of the data message that requires a Logical Response; The data transmission and processing; the logical checks at the destination; the transmission and receipt of the Logical Response.