Eventide ARGUS 5000 - Page 26

Similarly, the center item, labelled TK, is the (magnetic) ground track calculated by
the GPS, and the number in the upper right, 142 kts, is the ground speed calculated
by the GPS. If HEADING is selected in AMEND, the Magnetic heading of the
aircraft is shown instead. These numbers are all visible at the same time; many GPS
units will show only one or two of these at once. The Argus shows them all.
The final item in the upper window is calculated by the Argus. It is the Estimated
Time Enroute, and is determined by the Argus simply by dividing the distance-to-
waypoint by the groundspeed. The display format is HH:MM:SS. Many GPSs also
calculate the ETE, but this information is not transmitted to the Argus. You can also
select ETA (Estimated Time of Arrival) in AMEND, in which case your actual time
of arrival at the waypoint will be displayed. ETA is calculated by adding the ETE
value to the time kept by the Argus set in the time setting page of the AMEND mode.
Thus if the time is 20:00, and you will be at your destination waypoint in 12 minutes,
the field will read 20:12. (The time shown is local, not UTC, unless you have set
UTC as your TIME ZONE.) As long as your speed remains constant, the field will
not change, as clock time increases at the same rate as the time to the waypoint
decreases. It is normal and correct for this field to read essentially the same as you
approach the waypoint, with only small variations caused by changes in groundspeed.
Under certain circumstances, the information fields can be "dashed out", i.e., the
numerical information is replaced by dashes "—." This is done when information is
either unavailable from the GPS or is meaningless. If you haven't selected a waypoint
in the GPS, BRG, distance, and ETE cannot be displayed. If the aircraft is not
moving and you are not using heading orientation, neither TK nor groundspeed is
displayed since there is none. (And the map graphics are not displayed either, since
there is no way of orienting it.) If you are taxiing slowly, or have selected a waypoint
in the far distance, ETE might exceed 99 hours, and it will be "dashed."
July 1999 Argus 5000/7000 Ver. 5.xx Reference Manual Part#141003 17