Section 15
SEC. 15. Foreign Ship Mortgages—As used in Sections 12 to 18 hereof, the term "preferred mortgage" shall include, in addition to a preferred mortgage made pursuant to the provisions of this Decree, any mortgage, hypothecation, or similar charge created as security upon any documented foreran vessel if such mortgage, hypothecation, or similar charge has been duly and validly executed in accordance with the laws of the foreign nation under the laws of which the vessel is documented and has been duly registered in accordance with such laws in a public register either at the port of registry of the vessel or at a central office; and the term "preferred mortgage lien" shall also include the lien of such mortgage, hypothecation, or similar charge: Provided, however, That such "preferred mortgage lien" in the case of a foreign vessel shall be subordinate to maritime liens for repairs, supplies, towage, use of drydock or marine railway, or other necessaries, performed or supplied in the Philippines.