四、Please answer the following questions. What is Bridge Resource Management (BRM)?（5分）Also, what are the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW) requirements for masters, chief mates and all officers in charge of a navigational watch?（5分）In addition, what are the important factors forming an effective BRM at the stages of passage planning and navigational operations?（15分）Please give your opinions in English.