Garmin GNC 420(A) Pilot's Manual & Reference page 240

SECTION 13 – MESSAGES,
ABBREVIATIONS, & NAV TERMS
Term
EFF (efficiency)
ENDUR (endurance)
EPE (estimated
position error)
ESA (enroute safe
altitude)
ETA (estimate time of
arrival)
ETE (estimated time
enroute)
FF (fuel flow)
FOB (fuel on board)
GS (ground speed)
HDG (heading)
IND (indicated)
LFOB (left-over fuel
onboard)
LRES (left-over fuel
reserve)
MSA (minimum safe
altitude)
TKE (track angle
error)
TRK (track)
VSR (vertical speed
required)
XTK (crosstrack error) The distance the aircraft is off a desired course in either direction, left or right.
13-12
A measure of fuel consumption, expressed in distance per fuel units (e.g., nautical miles per
gallon).
Flight endurance, or total available flight time based upon available fuel.
A measure of satellite geometry quality and additional factors, expressed as a horizontal
position error in feet or meters.
The recommended minimum altitude within ten miles, left or right, of the desired course on an
active flight plan or direct-to.
The estimated time at which the aircraft will reach the destination waypoint, based upon
current speed and track.
The time it will take to reach the destination waypoint, from present position, based upon
current ground speed.
The fuel flow rate, expressed in fuel units per time (e.g., gallons per hour).
The total amount of usable fuel on board the aircraft.
The velocity of the aircraft relative to a ground position.
The direction an aircraft is pointed, based upon indications from a magnetic compass or a
properly set directional gyro.
Information provided by properly calibrated and set instrumentation in the aircraft panel (e.g.,
indicated altitude).
The amount of fuel remaining on board after the completion of a one or more legs of a flight
plan (or a direct-to).
The amount of fuel remaining on board after the completion of a one or more legs of a flight
plan (or a direct-to), expressed in time and based upon a known fuel consumption (flow) rate.
Uses Grid Minimum Off-route Altitudes (Grid MORAs) to determine a safe altitude within ten
miles of the present position. Grid MORAs are one degree latitude by one degree longitude
in size and clear all reference points within the grid by 1000 feet in areas where the highest
reference point is 5000 feet MSL or lower. If the highest reference point is above 5000 feet,
the Grid MORA will clear the highest reference point by 2000 feet.
The angle difference between the desired track and the current track. An arrow indicates the
proper direction to turn to reduce TKE to zero.
The direction of movement relative to a ground position. Also referred to as "ground track".
The vertical speed necessary to descend/climb from current position and altitude to a defined
target position and altitude, based upon current ground speed.
GNC 420(A) Pilot's Guide and Reference
Description
190-00140-20 Rev. K