Appraise, Plan, Execute And Monitor (APEM)

The four-stage process used to develop, carry out and continuously check a passage plan.

Appraisal gathers relevant information and assesses risks; planning converts it into a detailed berth-to-berth route and contingencies; execution manages the voyage; monitoring checks the vessel’s progress and the continuing validity of the plan.

The stages interact rather than forming a one-way checklist. New weather, traffic, equipment status, pilot information or position uncertainty may require renewed appraisal and replanning during execution.

Appraise – To assess the situation, vessel condition, and environmental factors to inform safe navigation decisions.
Plan – To develop a detailed course of action for a voyage, considering route, weather, tides, and safety measures.
Execute – To carry out the planned voyage or manoeuvre using appropriate seamanship and navigational practices.
Monitor – To continuously observe and evaluate the vessel’s progress and surrounding conditions to ensure the voyage remains safe and on course.