Unless the agreements made in accordance with section
738 of this Appendix provide otherwise, an ice patrol shall be maintained during the whole of the ice season in guarding the southeastern, southern, and southwestern limits of the region of icebergs in the vicinity of the Grand Banks of Newfoundland, and the patrol shall inform trans-Atlantic and other passing vessels by radio and such other means as are available of the ice conditions and the extent of the dangerous region. A service of study of ice and current conditions, a service of affording assistance to vessels and crews requiring aid, and a service of removing and destroying derelicts shall be maintained during the ice season and any or all such services may be maintained during the remainder of the year as may be advisable.