to the fact that a rather complete coverage had been obtahied on the 17th 

 of May. Unfortunately, undesirable weather conditions prevailed until 

 the 7th of June. 



Fourth Cruise, Mocoma, 6 June fo 22 June J 948 



The Mocoma departed from Argentia, Newfoundland, at 1248 G.c.t., 



5 June for ice patrol. On the 6th, while proceeding to rendezvous with 

 the Mendota, an SOS was received from the S. S. Nevada advising that she 

 had collided with an iceberg about 40 miles northeast of St. Johns, New- 

 foundland. The Mocoma immediately increased speed and headed 

 toward the Nevada. Two hours later the Nevada advised that her collision 

 bulkhead was holding and that she was proceeding toward St. Johns at 

 4 knots. Additional details of this incident are contained elsewhere in 

 this Bulletin in the section entitled "International Ice Patrol, 1948." 

 The Mocoma then altered course and headed for the rendezvous point. 

 The Mendota was met at 2225 G.c.t., 6 June, and relieved at 2307 G.c.t., 



6 June, at 43°34' N., 49°46' W. Meantime, early on the 6th, a ship 

 reported a berg at 41°19' N., 45°16' W. Upon relief of the Mendota, 

 the Mocoma immediately headed for this position, arriving there on the 

 8th. Between the 8th and the 11th a triangle bounded by lines con- 

 necting the following points was searched out with negative results: 

 41°19' N., 45°22' W.; 41°27' N., 43°08' W.; 43°30' N., 43°48' W. It is 

 considered highly likely that what the reporting ship actually saw was 

 another ship. Reasons for this are given elsewhere in this Bulletin in the 

 summary of Ice Conditions, 1948. 



The Mocoma, after failing to locate this berg, headed to the west 

 toward the Tail of the Banks. The area along the eastern edge of the 

 banks from the Tail of the Banks to the 44th parallel was scouted out 

 with negative results. An ice patrol plane had sighted a berg at 44°47' 

 N., 46°15' W., on the 14th and so course was set on the 15th to intercept 

 this berg and drift with it. This berg was located on the 16th at 44°40' 

 N., 45°40' W. The Mocoma drifted with this berg until the 20th. By 

 this time it had completely disintegrated. Its path is shown in figure 

 15. The Mocoma then headed west to rendezvous with the Mendota. 



At 1140 G.c.t., 22 June, the Mendota was met and relief effected at 

 45°21' N., 50°23' W. The Mocoma then set course for Argentia, New- 

 foundland, arriving there on the 23d. Figure 15 shows the track plot 

 of the cruise, all ice sighted, and its subsequent drift, if determined, and 

 surface isotherms for the period of the cruise. 



Following is a summary of water-temperatures, ice and obstructions 

 reports received during this cruise: 



Number of ice reports received 45 



Number of vessels furnishing ice reports 34 



Number of water-temperature reports received 720 



Number of vessels furnishing water-temperature reports 209 



Number of obstruction reports received 8 



Number of vessels furnished special information 55 



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