11 



NORTHERN OCEANOGRAPHIC CRUISE 



JUNE 26 TO JULY 2C 



Maximum air temperature 60° F. 



Minimum air temperature 32° F. 



Average air temperature 43.7° F. 



Visibility was less than 4 miles 34.3 percent 

 of the time. 



Visibility was less than 2 miles 22.6 percent 

 of the time. 



Figure 1 shows track of the cruise with noon 

 positions. 



Figure 5 shows detailed weather conditions 

 for the cruise. 



RADIO COMMUNICATIONS 



Radio always plays an important part in 

 carrying out the ice patrol. Only through 

 radio can ice information be gathered and 

 broadcast to shipping. Besides ice infor- 

 mation, vessels crossing the vicinity of the 

 Grand Banks reported weather conditions and 

 surface sea water temperatures every 4 hours 

 to the vessels on patrol. Radio bearings were 

 frequentW obtained from Cape Race. These 

 bearings together with fathometer soundings 

 are a great aid in locating the position of the 

 sliip during the long periods of fog that prevail 

 over the ice regions. 



The radio equipment of the Champlain was 

 the same type as that carried by the ice pa- 

 trol vessels in 1932. Tliis is described on page 

 18 of Ice Patrol Bulletin No. 22. 



The General Greene carried the following 

 radio equipment: 



One CGR-25A receiver for 1,000 to 75 kilo- 

 cycles. 



One CGR-30 receiver for 2,705 to 2,355 

 kilocycles. 



One T-5 200-watt transmitter for 249 to 

 500 Idiocy cles. This transmitter was used 

 for all ice broadcasts and worldng commercial 

 stations and merchant vessels. 



