12 - MESSAGES
ABBREVIATIONS &
NAV TERMS
203
Navigation Terms
The following navigation terms are used on the
500W-series unit:
WPT 1
XTK
NORTH
WPT 2
BRG
GS
DIS
AIRPLANE
DTK
TRK
ALT (altitude) —
Height above mean sea level
(MSL).
BRG (bearing) —
The compass direction from your
present position to a destination waypoint.
CAS (calibrated airspeed) —
Indicated airspeed
corrected for instrument errors.
CUM (cumulative) —
The total of all legs in a flight
plan (such as “cumulative distance”).
DIS (distance) —
The geodesic path from your pres-
ent position to a destination waypoint.
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.
EPU (estimated position uncertainty) —
A
measure of satellite geometry quality and additional
factors, expressed as a horizontal position error in feet
or meters.
ESA (en route safe altitude) —
The recommended
minimum altitude within a ten mile radius of your
course on an active flight plan or direct-to.
ETA (estimate time of arrival) —
The estimated
time at which you will reach your destination
waypoint, based upon current speed and track.
ETE (estimated time en route) —
The time it will
take to reach the destination waypoint, from present
position, based upon current ground speed.
FF (fuel flow) —
The fuel flow rate, expressed in fuel
units per time (e.g., gallons per hour).
FOB (fuel on board) —
The total amount of usable
fuel on board the aircraft.
Geodesic —
an arc path that follows the shortest dis-
tance along an ellipsoid model of the earth (WGS-84).
A geodesic is more accurate than a “great circle” which
assumes a perfect sphere model of the earth.
GS (ground speed) —
The velocity you are travelling
relative to a ground position.
HDG (heading) —
The direction an aircraft is
pointed, based upon indications from a magnetic
compass or a properly set directional gyro.
IND (indicated) —
Information provided by prop-
erly calibrated and set instrumentation in the aircraft
panel (e.g., “indicated altitude”).
Содержание GNS 530W
Страница 1: ...500W Series Pilot s Guide Reference...
Страница 10: ...INTRODUCTION viii Blank Page...
Страница 90: ...4 FLIGHT PLANS 80 Blank Page...
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Страница 196: ...9 AUX PAGES 186 Setup 2 Page Blank Page...
Страница 208: ...12 MESSAGES ABBREVIATIONS NAV TERMS 198 Blank Page...
Страница 228: ...APPENDIX D Index 218 Blank Page...
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