63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2 , 1947 (Chapter XIII, art. 33 RR) (727-733) 727§7. As an exception to the provisions of 714, 715 and 716 and on condition that signals of distress, urgency and safety, and calls and replies are not interfered with, the frequency 500 kc/s may also be used: 728 a) for the transmission of a single short radio- telegram exclusively by ship stations of Aus- tralia, India, New Zealand and Pakistan when operating in proximity to the coast of their respective countries; ) 729 b) outside areas of heavy traffic for direction-find- ing but with discretion. 730 § 8. (1) Ship stations employing class Al or A2 emis- sions in the authorized bands between 405 and 535 kc/s must use, wherever practicable, working frequencies chosen from amongst the following: 425, 454, 468 and 480 kc/s. In addition, the frequency 512 kc/s may be used in regions 1 and 3 and the frequency 448 kc/s in region 2. 731 (2) No coast station is authorized to transmit on these working frequencies allocated for the use of ship stations on a world wide basis or on the working frequency allocated for the use of ship stations in the region in which the coast sta- tion is situated. 732 (3) In regions 1 and 3 the frequency 512 kc/s may also be used by ship and coast stations as a supplementary calling frequency when 500 kc/s is being used for distress purposes. D. Watch. 733 § 9. (1) In order to increase the safety of life at sea and over the sea, all stations of the maritime mobile service normally keeping watch on frequencies in the authorized bands between 405 and 535 kc/s must, during their hours of ser- vice, take the necessary measures to ensure watch on the 728.1 " Certain coast stations of India and Pakistan are also permitted tem- porarily to transmit a single short radiotelegrar on 500 ke/s. 1857
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