The date when musters are held, details of abandon ship
drills and fire drills enclosed space entry and rescue drills, drills
of other life-saving appliances and on-board training shall be recorded
in such log-book as may be prescribed by the Administration. If a
full muster, drill or training session is not held at the appointed
time, an entry shall be made in the log-book stating the circumstances
and the extent of the muster, drill or training session held.