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CAPT. JOHN NORDLANDER OF THE DROTTNINGHOLM AND EDWARD OSCH- MANN OF RADIOMARINE EXAMINE A LORAN CHART AS FIRST OFFICER JONSSON LOOKS ON. AT RIGHT: LORAN RECEIVER INSTALLED IN CHART ROOM OF THE DROTTNINGHOLM. Navigating by Loran WAR-BORN NAVIGAT/ONAL A/D. AS DEVELOPED BY RCA. DEMON- STRATES ITS EFFECTIVENESS ON THE ATLANTIC AND PACIFIC By Charles J. Pannill President, Radiomarine Corp. of America TWO of the latest models of loran receivers, designed and built by Radiomarine Corporation of America, are demonstrating their dependability as highly accu- rate navigational aids on ships ply- ing both Atlantic and Pacific Oceans. One of the units was installed on the Swedish American liner Drott- ningholm and has been in operation throughout several round trips be- tween New York and Gothenburg. G. H. Lundbeck, Jr., United States Managing Director of the Swedish American line, arranged for this installation through the RCA Inter- national Division which handles foreign sales for Radiomarine. Officials of the steamship line em- phasized the importance of loran on the voyage and said that all ves- sels of the line will employ this type of navigational equipment as peace- time services are resumed. The second unit is aboard the Waterman liner J. B. Waterman now enroute to China from a gulf port. The loran system is a modern electronic method by which naviga- tors may determine their position accurately and quickly by the use of radio signals transmitted from fixed stations. Loran is a contrac- tion of the words LOng RAnge Navigation since its principal char- acteristic is its ability to furnish positions to navigators at much greater distances from land than can be obtained by other methods of radio navigation. When the Drottningholm put to sea on its first loran-guided voyage, Edward F. Oschmann, loran test engineer of Radiomarine went along to demonstrate the apparatus to Captain John Nordlander and First Officer C. W. Jonsson. Oschmann is believed to be the first man in mer- chant ship history to sign ship's articles as a loran opei'ator. Use of loran on the first eastward voyage of the Drottningholm com- menced as soon as the ship passed out of New York harbor. Bearings taken near Ambrose lightship showed an actual accuracy of one tenth mile. From that time on, fre- quent checks were made night and day with equal or better accuracy. In the daytime, the signals supplied by loran coastal stations had a de- pendable range of 700 miles. At night this range increased to 1400 miles because of the greater cover- age made possible by the reflection of signals from the Heaviside layer. Oschmann reported that ship's officers, after only short periods of instruction, attained competent ac- curacy in handling Radiomarine's loran equipment. Although navi- [18 RADIO AGE]