Garmin 420 Guida Utente

GNS 430 Pilot’s Guide and Reference

13-12

13.3  NAVIGATION TERMS

The following navigation terms are used on the GNS 

430 and in this Pilot’s Guide.  Refer to Figures 11-1 and 
11-2 for graphic representation of navigation terms.

WPT 1

XTK

NORTH

WPT 2

BRG

GS

DIS

AIRPLANE

DTK

TRK

VERTICAL NAVIGATION PROFILE

VERTICAL SPEED REQUIRED

DISTANCE TO TARGET

TIME AND DISTANCE 
       TO PROFILE

TARGET ALTITUDE
   AND POSITION

AIRPORT

CURRENT ALTITUDE
   AND POSITION

  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 (such as ‘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.

  EPE (estimated position error) - A measure of 

satellite geometry quality and additional factors, 
expressed as a horizontal position error in feet or 
meters.

  ESA (enroute safe altitude) - The 

recommended minimum altitude within ten miles, 
left or right, of the desired course on an active 
flight plan or direct-to.