Garmin GNC 420W Pilots Guide - Page 240
HDG heading, GS ground speed
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SECTION 13 - MESSAGES, ABBREVIATIONS, & NAV TERMS Term Description 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. ETA (estimate time of The estimated time at which the aircraft will reach the destination waypoint, based upon 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 of the aircraft 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 properly calibrated and set instrumentation in the aircraft panel (e.g., 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. MSA (minimum safe altitude) 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. TKE (track angle error) The angle difference between the desired track and the current track. An arrow indicates the 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 current ground speed. XTK (crosstrack error) The distance the aircraft is off a desired course in either direction, left or right. 13-12 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K
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