CAST
US abbreviation for 'Change Average Speed To' – the instruction in a TSD rally to drive a new prescribed average speed from that point on.
CAST stands for 'Change Average Speed To' and is a core instruction in American TSD (Time-Speed-Distance) rallying. It specifies that from a given point a new prescribed average speed must be maintained. From this and the distance covered, the navigator works out the due time at each control. CAST instructions appear in the route instructions and are the counterpart to the average-speed requirement of the European regularity test.
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Related terms
Average-speed table
Table giving, for a prescribed average speed, the target time for each distance – an aid in regularity stages.
TSD rally
Time-Speed-Distance rally: a regularity format in which prescribed averages, derived from time, speed and distance, must be kept exactly.
Rallymaster
In Anglo-American rallying, the person who designs and lays out the rally – route, average-speed changes (CAST), pauses and controls. Roughly the equivalent of the rally direction.