The proposals of Calvert and Hollingdale (Journal, 13, 127; 14, 234, 379; 18, 141) are of considerable interest. Soviet research work similarly leads to the conclusion that the principle of anti-clockwise rotation of the line of sight is the best if not the only way to solve the problem of manœuvring in fog whilst using radar. A rule of manœuvre embodying this principle was described in Morskoi Flot No. 5, 1958 and later proposed by the Soviet Delegation at the Safety of Life at Sea Conference in London in 1960. The instructions to Soviet ships on the use of radar for collisionavoidance were published and deposited with I.M.C.O. as an official document.

Some years later Die Seewarte (Hamburg, October 1961) and Navigation (Paris, July 1962) published an account of an electronic manœuvre indicator constructed in the U.S.S.R. and described in Morskoi Flot No. 2, 1959. The trials of this instrument were described in Morskoi Flot No. 12, 1964. These publications should be of interest to members of this Institute.