# Maintain Port Costs You can choose to use either the Actual Port Cost or Preliminary Port Cost of previous port calls to update the port cost of the selected port call.

To make use of a Preliminary Port Cost of a port call on the system, click the

button to the right of the Preliminary column. To make use of an Actual Port Cost of a port call on the system , click the

button to the right of the Actual column. Clicking this button will also update the currency of the port cost of the selected port call to the currency shown on the row. Clicking any of the "Use" button will update the port call's port cost, which will be accumulated on the voyage's overall port costs. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.dataloy.com/release-8.25/voyage-management-system/step-by-step-guides/voyages/maintain-voyages/overview/schedule/maintain-port-calls.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.