GNS 430(A) Pilot’s Guide and Reference
190-00140-00 Rev. P
SECTION 14 – MESSAGES,
ABBREVIATIONS, & NAV TERMS
14-12
14.3 NAVIGATION TERMS
The following navigation terms are used on the GNS 430 and in this Pilot’s Guide. Refer to Figures 14-1 and
14-2 for graphic representation of navigation terms.
WPT 1
XTK
NORTH
WPT 2
BRG
GS
DIS
AIRPLANE
DTK
TRK
Figure 14-1 Illustrated NAV Terms
VERTICAL NAVIGATION PROFILE
VERTICAL SPEED REQUIRED
DISTANCE TO TARGET
TIME AND DISTANCE
TO PROFILE
TARGET ALTITUDE
AND POSITION
AIRPORT
CURRENT ALTITUDE
AND POSITION
Figure 14-2 Illustrated Vertical NAV Terms
Term Description
ALT (altitude) Height above mean sea level (MSL).
BRG (bearing) The compass direction from the present position to a destination waypoint.
CAS (calibrated
airspeed)
Indicated airspeed corrected for instrument errors.
CTS (course to steer)
The recommended direction to steer in order to reduce course error or stay on course. Provides
the most efficient heading to get back to the desired course and proceed along the flight plan.
CUM (cumulative) The total of all legs in a flight plan (cumulative distance).
DIS (distance) The ‘great circle’ distance from the present position to a destination waypoint.
DOP (dilution of
precision)
A measure of satellite geometry quality on a scale of one to ten (lowest numbers are best,
highest numbers are worst).
DTK (desired track) The desired course between the active “from” and “to” waypoints.
EFF (efficiency)
A measure of fuel consumption, expressed in distance per fuel units (e.g., nautical miles per
gallon).
ENDUR (endurance) Flight endurance, or total available flight time based upon available fuel.
