810. INTERNATIONAL ONLY Power-driven vessels «A» and «B» are meeting on a river as shown in illustration D041RR below and will pass 1/4 mile apart. Which action should the vessels take?

Since the vessels can safely pass without maneuvering, no whistle signals are required under the International Rules. These rules do not mandate whistle signals for passing arrangements, unlike the Inland Rules, and neither vessel needs to alter course or speed to avoid collision.