Garmin GNS 430 Pilot's Manual & Reference page 249

EPE (estimated
A measure of satellite geometry quality and additional factors, expressed as a horizontal
position error)
position error in feet or meters.
ESA (enroute safe The recommended minimum altitude within ten miles, left or right, of the desired course on an
altitude)
active flight plan or direct-to.
ETA (estimated time The estimated time at which the aircraft will reach the destination waypoint, based upon
of arrival) current speed and track.
ETE (estimated time The time it will take to reach the destination waypoint, from present position, based upon
enroute) 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.
GS (ground speed) The velocity the aircraft is travelling relative to a ground position.
The direction an aircraft is pointed, based upon indications from a magnetic compass or a
HDG (heading)
properly set directional gyro.
Information provided by properly calibrated and set instrumentation in the aircraft panel (e.g.,
IND (indicated)
indicated altitude).
LFOB (left-over fuel The amount of fuel remaining on board after the completion of a one or more legs of a flight
onboard)
plan (or a direct-to).
LRES (left-over fuel The amount of fuel remaining on board after the completion of a one or more legs of a flight
reserve) 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
MSA (minimum safe
in size and clear all reference points within the grid by 1000 feet in areas where the highest
altitude)
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.
TKE (track angle The angle difference between the desired track and the current track. An arrow indicates the
error)
proper direction to turn to reduce TKE to zero.
TRK (track) The direction of movement relative to a ground position. Also referred to as "ground track".
VSR (vertical speed
The vertical speed necessary to descend/climb from current position and altitude to a defined
required) target position and altitude, based upon the current ground speed.
XTK (crosstrack error) The distance the aircraft is off a desired course in either direction, left or right.
190-00140-00 Rev. P GNS 430(A) Pilot's Guide and Reference
SECTION 14 – MESSAGES,
ABBREVIATIONS, & NAV TERMS
14-13