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DEFINITIONS, ACRONYMS AND ABBREVIATIONS
Definitions
alphabetic: any of the following characters (b/ is a space):
b/ABCDEFGHIJKLMNOPQRSTUVWXYZ
alphanumeric: any of the following characters (b/ is a space):
b/ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
baud: bits per sec
barometric altitude: pressure altitude corrected for barometric altimeter setting
bearing to user waypoint: bearing from the present position to the active user waypoint measured
clockwise relative to true or magnetic north (true is implied unless magnetic is specified)
cross track error: distance from the present position to the nearest point on the desired course, and
the direction (right or left) from the desired course to the present position
cursor field: a character position or group of adjacent character positions on which a cursor can
appear
data entry field: A data entry field is a data field where the ENTER, SET or SELECT button must be
pressed before data entered in the field becomes effective. A data entry field can be a single or
multiple character cursor field. During data entry, the active cursor field remains reverse video.
data field: a character position or group of adjacent character positions which display a single data
item; a data field may be a single character cursor field, or may contain multiple characters.
data list: an ordered list of data elements which a given cursor field can accept
desired track: The angle, which the desired flight path makes with respect to true north at the point
nearest the present position. Magnetic desired track uses the local magnetic variation.
destination: If the active user waypoint is not in the active flight plan, the active user waypoint is the
destination. If the active user waypoint is in the active flight plan, the final user waypoint in the flight
plan is the destination.
distance to user waypoint: distance from the present position to the active user waypoint
en route safe altitude: the highest minimum safe altitude which will be encountered for a given flight
path (present position to destination, via flight plan if appropriate; or a flight path being analysed by trip
planning)
flashing: active for .75 sec
∀
.05 sec, inactive for .25 sec
∀
.05 sec
ground speed: absolute value of the rate of change of position
headwind: difference between true airspeed and ground speed when true airspeed is more than
ground speed
knots: N.M./hr
minimum safe altitude: Minimum safe altitude is the highest minimum off route altitude for any
sector within a 10 N.M. square centred at a given position. A minimum off route altitude of 7000 feet
or less clears all known obstructions and terrain in a sector by 1000 feet; a minimum off route altitude
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