Related Rule
Ecuador
Practice relating to Rule 66. Non-Hostile Contacts between the Parties to the Conflict
Ecuador’s Naval Manual (1989) states: “Customary international law recognizes the white flag as symbolizing a request to cease-fire, negotiate, or surrender.” 
Ecuador, Aspectos Importantes del Derecho Internacional Marítimo que Deben Tener Presente los Comandantes de los Buques, Academia de Guerra Naval, 1989, § 11.10.4.