Raytheon NautoPilot NP 5100 Operator's Manual page 34

OPERATION
NautoPilot 5000 Series
Rate of Turn influence on Course Control
The Rate of Turn upon activation of Course Control must not exceed 30/minute.
Speed influence on Course Control
The speed before activation of Course Control mode must not be less than this value,
which is configured as the "Low speed" value.
Otherwise a "Speed too slow" message is displayed and Course Control mode cannot
be activated.
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4002.DOC010102 Edition: September 2014