[The] perception that the masters and OOWs know well the local conditions and routines can lead both pilots and ship officers to take a lot for granted. Both groups can assume that they share a common mental model of the area and the plan, without having to review it together. This situation can lead to the bridge personnel and the pilot surprising each other. In a dynamic situation, this can easily get out of hand. One person assuming that another shares the same assessment of a situation can take action which the other does not expect. This places both of them in a difficult situation. Misunderstandings can build on each other, destroying mutual support or teamwork, and even leading to conflict. Prior discussion and agreement on the plan and mutual acceptance of duties and responsibilities, however, will usually foster teamwork.
Transport Safety Board of Canada (1995). A Safety Study of the Operational Relationship Between Ship Masters/Watchkeeping Officers and Marine Pilots. Available at <http://ntl.bts.gov/data/letter_nz/pilot.pdf>