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.
Hologram 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")
In 2385, Hologram Janeway upgraded into the Emergency Command Hologram of the new USS Prodigy as well as its training officer. (PRO: "Ouroboros, Part II")