Home' RTCA Documents for Review : DO-201B User Requirements for Navigation Data Contents ED-77A/DO-201BforOpenConsultation/FRAC
© EUROCAE, 2018
The diverse types of radio navigation systems are used to determine the position of the
aircraft relative to the position of a ground radio station or navaid. They evolved from
being the main positional data source in the cockpit to be used now as a backup for
Radio communication systems are used to ensure voice and data communications
between the aircraft and the ground. Each system fulfils a distinct communication need:
ATC communication, real-time data exchange, etc.
Radio navigation data used in navigation databases allow for automatic radio tuning,
determination of the aircraft location by triangulation using one or more navaid and
discrimination/exclusion of ground stations un-suitable for navigation.
Radio communication data present in a navigation database is used to reduce the pilot
workload and lowers the chance of radio tuning errors.
DATA DRIVEN CHARTS
Data Driven Charts (DDC) provide an electronic display of navigational data such as
terminal area or enroute procedures, airspace, and other traditional charting products.
The data is generated as symbology elements on the multi-function map display using
data retrieved from an aeronautical database. The information is merged with the
moving map providing a geo-referenced representation of the plan view along with other
elements displayed on the moving map such as terrain, weather, traffic, airspace, etc.
DDC offers a tactical view of the navigation data allowing the crew to monitor progress
during the flight, thus enhancing the situational awareness features of the moving map.
The purpose of the DDC function is to increase the pilot’s ability to integrate the
information from charts with the information from the flight deck while reducing the pilot’s
workload. DDC offers the benefits of reducing the amount of “cluttered” information
presented to the pilot which increases the ability to superimpose data categories on the
map, enhancing the ability of the crew to accurately navigate. Reductions in pilot
workload, response time, error rate, and increased situational awareness are expected
as the core human factors benefits of DDC.
DDC can be coupled with a separate electronic ‘Chart Viewer’, which displays fixed
static charts so the crew can brief the chart information before executing and monitoring
the procedure within the tactical map view. The briefing chart view of the current
procedure can be displayed through the fixed chart viewer with a single control selection
provided by the DDC user interface.
DDC operates as layer(s) in the moving map environment, which can be enabled and
disabled just like any other moving map layer. As an example of a typical use, DDC
generates an electronic display for all the terminal procedures (SIDs, STARs and
instrument approaches) that are entered in the FMS flight plan, provided the procedures
are included in the DDC database. DDC presents the information necessary to
effectively monitor the procedures during execution and to validate the FMS; it may not
however, provide all the information necessary for briefing. DDC can provide the
capability for the operator to search for an airport and manually select terminal
procedures available for that airport.
Figure A-9 illustrates how DDC provides information and controls on the moving map
Note: The figure provided in this specification is illustrative and is not an accurate
representation of the display. DDC being a common product contains tailorable and
common elements which contribute to the accurate representation of the display.
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