BENDIXKing AeroNav 910 Pilot's Manual page 115

AeroNav 900/880 Series Pilot's Guide
The function is activated on the FMS Setup page by setting the
"Patterns" field to "On".
Circular Orbit Pattern Selection in FMS Setup
Once on, the leg type is selected just like all other leg types but is
only available after a leg that is not part of a terminal procedure.
89000039-010
Rev 1 May 2019 FMS Subsystem 3-21