(a) At 6 a. m. and 6 p. m. (75th meridian time) ice information 

 will be sent broadcast for the benefit of vessels, using 600-meter 

 wave length. This message will be sent three times, with an interval 

 of two minutes between each. 



(h) At 8 p. m. (75th meridian time) a radiogram will be sent to the 

 Hydrographic OfHce, Washington, D. C, defining the ice danger zone, 

 its southern limits, or other definite ice news. The telegraphic ad- 

 dress of the Hydrographic Office is ''Hydrographic, Washington." 



(c) Ice information will be given at any time to any ship with 

 which the patrol vessel can communicate 



id) Radio communication shall be carried on by the most practi- 

 cable and convenient route, having due regard for the economy which 

 may be effected by transmitting through naval radio stations. Bar 

 Harbor has been instructed to give priority to all traffic to and from 

 vessels on ice-patrol duty, and that station should normally be used, 

 if possible. Bar Harbor can receive either day or night from the 

 Canadian radio station at Glace Bay, Cape Breton Island. It is 

 suggested that, whenever the vessel on patrol duty may be unable to 

 communicate directly with Bar Harbor, the station at Glace Bay 

 would provide means of relaying the dispatch more quickly than the 

 station at Cape Race. Headquarters will route all messages for 

 vessels on ice patrol through Bar Harbor. If, for any reason, patrol 

 vessels are unable to receive from Bar Harbor, headquarters shall 

 be advised of that fact by any means available, in order that messages 

 may bo routed through Cape Race. 



6. Ice information will be given in as plain, concise English as 

 practicable, and will be stated in the following order: 



(a) Position of patrol vessel. 



(h) Location and description of ice. 



(c) Other data as may be necessary. 



7. Attention is called to article 3235 (c), Regulations, the pro- 

 visions of which will be followed in radiograms sent to the Hydro- 

 graphic Office. (See par. 5-h of this order.) In radiograms sent to 

 vessels other than Coast Guard cutters the words "latitude" and 

 ''longitude" will be used. 



S. While on this duty the patrol vessels will endeavor by means 

 of daily radio messages to keep ships at sea advised of the limits of 

 the ice fields, etc. 



9. The ice patrol vessels' radio call letters are KFOG. This is a 

 special "call' for the vessel actually on patrol, and must not be 

 confounded with the regular "call letters" of the vessels. The patrol 

 vessels shall use a wave length of 600 meters when communicating 

 with passing vessels. 



10. The radio messages from the patrol ship will be given publicity 

 immediately upon their receipt by the Hydrographic Office, Wash- 



