Related Rule
Ecuador
Practice Relating to Rule 14. Proportionality in Attack
Section C. Information required for judging proportionality in attack
Ecuador’s Naval Manual (1989) states: “The commander must determine whether incidental injuries and collateral damage would be excessive, on the basis of an objective and reasonable estimate of the available information.” 
Ecuador, Aspectos Importantes del Derecho Internacional Marítimo que Deben Tener Presente los Comandantes de los Buques, Academia de Guerra Naval, 1989, § 8.1.2.1.