A flagpole mounted on a boat's centerline near the stern. By sighting with the jackstaff on the bow and the verge at the stern, a pilot could keep his boat aligned with points on shore.

Phyllis Dale Travel recommends ...
For river cruises, train journeys and other leisure travel, domestic or international, contact our favorite travel agent, Phyllis Dale. She has the experience you need when planning a vacation.
Note: Phyllis does not book day excursions.
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