Yeoman Rand does fill-in at the helm in one TOS episode. Maybe Colt is temporarily fill-in in while the regular console operator is in the loo?she's manning a bridge station and doesn't do anything particularly "Yeoman-like"
Maybe part of being a starfleet yeoman is being able to fill-in just about everywhere? Not a expert, but knowledge of basic systems operation.
Kirk: "Rand. Everyone on engieering level three was just killed, get down there and bring the starboard matter antimatter reactors back under control."
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