Channel Detail
The reconstruction of the course of the submarine H.50 was done with the help of these elements in the log books:
0600 UT 270° 9.6 NM in the preceding hour
0700 UT 270° 8.6 NM in the preceding hour
0728 UT 290°  
0800 UT 290° 9.0 NM in the preceding hour
0851 UT 300°  
0900 UT Jetty 8.8 NM in the preceding hour

All courses are true. The submarine’s positions are represented by the white squares. The point at 20 NM to the southwest of the Needles is represented by star and the point at 20 statute miles by the black circle. The positions given by the newspapers are represented by black diamonds.

British Summer Time = UT + 1.