A training advisor or training officer was an entity with more and deeper knowledge in a specific area and usually also included cross-functional and multidisciplinary expertise. A training advisor's role was that of a mentor and teacher.
The hologram Kathryn Janeway was an advisory hologram based on Captain Kathryn Janeway. She was programmed to assist the crew of the USS Protostar. (PRO: "Lost and Found")
The training officer also kept a training officer's log. (PRO: "Time Amok")