base waypoint with the indicated
Longitude Waypoints. Latitude-longitude waypoints
are entered in the form of degrees and minutes
followed by optional decimal minutes or seconds and
decimal seconds. The required format is an N or S
followed by four or six digits, with a decimal point and
up to three additional optional digits and followed by E
or W with five or seven digits, with a decimal point and
up to three additional digits optional.
Latitude-longitude waypoints are displayed as
whole minutes on all CDU pages except in the
scratchpad when the value is copied and on the
Position, Integrated Navigation, Start 1, or Data pages
where thousandths of minutes are displayed.
Waypoints. Identifiers are entered as up to five
alphanumeric. Identifier waypoints are displayed left
justified, with alphabetic characters always written as
capital letters. Crew-entered identifiers are limited to
between two and five characters. Single character
identifiers cannot be entered by the crew and are only
accessed by inserting a SID, STAR, or approach that
includes such a waypoint in the procedure.
(e) Entry and Display of Identifier /
Bearing / Distance Waypoints. Identifier / bearing /
distance waypoints are entered as an identifier
followed by a /, followed by the bearing, followed by a
/, followed by distance. Bearings are entered as three
digits optionally followed by a decimal point and an
additional digit. Bearing is displayed as three digits
rounded to the nearest degree. An entry of 145.3° will
be displayed as 145°. In the case of a number such
as 145.5°, the CDU always rounds up to the nearest
whole number. Distances are entered as up to four
digits optionally followed by a decimal point and one
When a bearing/distance is applied to a
waypoint, the waypoint will appear as one of the
1. If the waypoint is an ICAO
999 nm or less, the waypoint will
be displayed as identifier/bearing/
distance (e.g. EDW/350/45).
2. If the waypoint is not a waypoint
identifier or the distance is greater
than 999 nm, the waypoint will be
displayed as latitude/longitude.
(f) Use of Magnetic Variation and
Declination. Magnetic variation is used in converting
most azimuth angles from true to magnetic reference.
Courses into navaid waypoints and any offset
waypoints described relative to these waypoints use
stored station declination rather than magnetic
variation in the computations, so that they match those
on published Instrument Flight Rules (IFR) charts.
(g) Entry and Display of Time and Date.
Time is entered with no delineators between hours,
minutes, and seconds. Seconds are optional, so that
three to six digits are acceptable. If no time or date is
available for a given field, blanks are displayed. All
times are entered and displayed as Coordinated
Universal Time (UTC). Dates are entered and written
using the military convention of day, month, year (six
digits total). Example would be 16/12/97 (December
The FMS-800 system has been designed to
avoid date and time rollover problems. The operator
will not see problems if a current date and time are
entered into the CDU prior to initializing GPS modules.
(h) Deletion of Data. Most data entry
fields may have the associated data deleted by
entering a in the scratchpad and pressing the line
select adjacent to the desired field. In some cases,
the dash entry causes the data to revert to a fixed
default value (e.g., wind to 360º/0).
(3) System Annunciations and Scratchpad
Messages. The CDU will alert the crew of avionics
failures, degraded operations, system modes of
operation, or operator entry errors via the CDU
annunciation line and scratchpad.
(a) Annunciations on the annunciation
line of the CDU.
displayed locally on the CDU causing the condition.
(c) Master CDU alert annunciation is
provided as an external alert in the pilots primary field
annunciations and scratchpad messages.