REGULATIONS. 



SAFETY OF NAVIGATION. 



Article I. 



CODE FOR THE TRANSMISSION BY RADIOTELEGRAPHY OF INFORMATION 

 RELATING TO ICE, DERELICTS, AND WEATHER. 



INSTRUCTIONS. 



Transmission of information. — The transmission of information concerning ice and 

 derelicts is obligatory. This information may be sent from ship to ship or to the Hydro- 

 graphic Office, Washington, either in clear or by means of the abbreviations used in Part I 

 of this Code. 



The transmission of information relating to weather is optional. Part II of this Code 

 may be used for this purpose, but may be modified at any time by the meteorological con- 

 gresses. 



Information required: 



PART I. ICE AND DERELICTS. 



1 . The kind of ice or derelict observed. 



2. The position of ice or derelict wfhen last determined. 



PART II. METEOROLOGICAL INFORMATION. 



L The direction and force of the wind. 



2. The set and velocity of the current. 



3. Weather or state of the sky at a fixed hour. 



4. Height of barometer and air temperature. 



5. Barometric tendency and sea-surface temperature. 



Time to be adopted. — In all radiotelegrams relating to ice or derelicts the time shall be 

 given in Greenwich mean time. 



Address. — Reports, when sent to the Hydrographic Office, Washington, should be ad- 

 dressed "Hydrographic" ; reports to the Meteorological Office, London, should be addressed 

 "Meteorology." 



Message. — L When sending information about ice or derelicts alone, two groups of five 

 figures each are used, preceded by the word "i ce" ; these groups may be repeated as often as 

 necessary. 



2. If meteorological information is to be sent in addition, a further four groups of five 

 figures each are used, preceded by the word "weather." These groups are inserted at the end 

 of the message after all the information relating to ice has been given. 



