Eventide ARGUS 5000 - Page 201

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certain mismatches do not create actual errors, but rather cause the Argus to interpret
the data as gibberish, which will show up as INVALID data.
NO HEADING OR TRACK Message
This message will be encountered v/hen the aircraft is not moving if the Argus is not
integrated with the aircraft compass system or TRACK has been selected in AMEND.
It is impossible to orient the map display without knowing which way the aircraft is
pointing. When the aircraft is moving (forward, we hope) at taxi or greater speed, the
nav receiver calculates the track and sends this to the Argus. The minimum speed
varies with the type (Loran or GPS) and model of receiver. Of course, position
information is still available whether or not the aircraft is moving.
July 1999 Argus 5000/7000 Ver. 5.xx Reference Manual Part#141003 197