Having the correct time is important in all navigation,but is paramount for celestial. Determining longitude has always been the strictest test of timekeeping which is today improved by quartz cl ocks and worldwide broadcast time signals. These time signals are broadcast on shortwave frequencies of 2.5,5,10,15,and 20 MHz in the USA,and a few others in the rest of the world. In the past,there have been inexpensive radios whose crystal settings have been dedi cated to receiving just these frequencies. These radios are no longer available,but digital tuning technology (like your car radio that can seek and scan)has made ordinary shortwave radios capable of receiving these signals reliably.
The world band radios in this catalog are all suitable for this purpose. As an alternative,one may phone the U.S.Naval Observatory at the following number,and hear a transcription of the time signals or visit our web site to view the time as a link from them. For the time call: 1-202-762-1401 40 Order by telephone +1-316-686-9785 CHOOSING A WORLD BAND RADIO The job for a world band radio is tough.Crowded signals traveling long distances require proper equipment for good reception.Yet,there is a global free-for-all in the manu- facturing and merchandising of these radios.Some do an excellent job,and some are sold on the basis of good looks whi l e havi ng terri bl e performance.The fol l owi ng poi nts should be considered in making your selection. decent price for good equipment.great for travel,but poor for the home.are poor for travel. 3.TUNING-Digital tuning,ordinary program listening,that comes
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