Final answer:
Captains night orders consist of standing orders and emergency orders. Standing orders are ongoing directives for regular operations, while emergency orders outline procedures for potential crises.
Step-by-step explanation:
The two types of orders contained in captain's night orders are a) Standing orders and emergency orders. Standing orders are a set of guidelines that are always in effect, and the crew is expected to follow these at all times, irrespective of changing circumstances. They cover regular operational aspects and procedures of the vessel. On the other hand, emergency orders are specific instructions prepared by the captain in anticipation of foreseeable emergencies that might occur overnight. These orders would detail the immediate actions to be taken by the night watch in the event of an emergency situation, such as man overboard, fire, or collision.