(c) At 7 p. m. (75th meridian time) a radiogram will be sent to 

 the Hydrographic Office, Washington, D. C, defining the ice danger 

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

 address of the Hydrographic Office is '' Hydrographic, Washington.'^ 



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

 which the patrol vessel can communicate. 



' (e) Radio communication shall be carried on by the most prac- 

 ticable 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 traflSc to and 

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

 used if possible. Bar Harbor can receive either night or day 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 shaU 

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

 may be routed through Cape Race. 



2. The above instructions shall be effective as of the beginning of 

 the day on May 1, 1923. 



W. E. Reynolds, Commandant. 



