Some older RNAV systems, built in the 1980 and 90s may not have a database and waypoints must be manually loaded. The ‘data packer’ then prepares the ARINC 424 coded data into the format and elements suitable for use by the specific target computer.
Once the aeronautical data has been coded, it is then passed to the data packer, who is generally the company that built the navigation computer. The coding of the data is based on the industry standard ARINC 424.
TERRESTRIAL AIR NAVIGATION CODE
The data is sourced from States' Aeronautical Information Publications (AIPs) by professional third parties, known as ‘Data Houses’, who prepare and code the required information for the on-board database which is updated every 28 days under a scheme known as the AIRAC cycle. Most navigation specifications require the navigation computer to have a navigation database containing the elements that are needed to construct the flight plan. PBN Navigation Applications applied in terminal airspace do not allow the pilot manually to create waypoints. Most PBN navigation specifications require the computer to have a DB the data held in the DB must come from an 'approved supplier' (see the Aeronautical Data section for further information on approved suppliers) and that database must be kept up-to-date in accordance with the ICAO Annex 15 Air Regulated Cycle (ARAC cycle). The pilot will create the route by either manually inserting the waypoint coordinates or, more commonly today, by extracting the waypoints from the computer's Navigation Database (DB). This information could then be presented to the flight crew on Primary Flight Displays (PFD) and Navigation Displays (ND). Alternatively, the navigation computer may be integrated into a Flight Management System (FMS) and the computer has multiple position sensors feeding into it and, possibly, information from an Air Data Computer, which would allow the computer to calculate both horizontal and vertical position relative to a defined path. This computer may be a simple 'stand-alone' computer providing its output to the pilot on its own 'built in' Course Deviation Indicator a good example of this would be a commercially bought GPS receiver. If you notice any errors or omissions, contact us so that we may correct them.Area navigation can only be achieved with the use of a navigation computer on-board the aircraft.
The information in this directory is compiled from various sources and is subject to continual change. Their operations also include: the supply of aeronautical information services, technical maintenance and aerodrome services alert, search and rescue coordination services management of the flexible use of airspace through the Central Airspace Unit (CAMU) support for special events, and special requirements such as test flights and demonstration flights the implementation and maintenance of a terrestrial-based navigational structure and the training of licensed air traffic controllers and technical staff through the Aviation Training Academy (ATA). Their services extend further than the familiar air traffic control service, into the provision of vitally important aeronautical information used for all flight planning purposes, as well as search and rescue coordination activities and the maintenance of a reliable navigation infrastructure. The mission of Air Traffic and Navigation Services SOC Ltd (ATNS) is to provide safe, expeditious and efficient air traffic management solutions and associated services, while ensuring long-term economic, social and environmental sustainability.ĪTNS is responsible for air traffic control in approximately 10% of the world's airspace.
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