In some cases a routine radio message has been received from aircraft reporting everything in order a few minutes before all contact was lost,
in others a weak U.O.S. message has been picked up and,in perfect weather,inexplicable references to fog and loss of bearings.

你这个句子似乎有两处拼写错误，否则我看没法翻译。 u.o.s应该是s.o.s， inexplicable应该是inexplicably。
如果我的猜测是正确的，那么这句话的意思是：
有时候，会收到飞机在失去联系前几分钟发出的例行信息，显示飞机一切正常。而有时候在非常好的天气中，会收到解释不通的飞机遇到迷雾或者失去方向的信息。