Final answer:
Approximately 30 minutes after passing an oceanic waypoint, crews should plot the latitude, longitude, and time on the plotting chart.
Step-by-step explanation:
Approximately 30 minutes after passing an oceanic waypoint, crews should plot the latitude, longitude, and time on the plotting chart. This allows them to accurately track their position and navigate the ocean. It is crucial for navigational purposes to regularly update and record the ship's position during the voyage.