. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . PANAMA PUERTO RICO Figure 2-2.—The Marine Radiobeacon System of the United States, 1949. When first introduced, these installations were called radio fog signals or wireless fog signals because they were originally planned for use in fog; but they have developed, as will be described, into valuable aids in either fog or clear weather. Therefore, the restrictive name, "radio fog signal," was considered inappropriate. In this country, the direction f
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . PANAMA PUERTO RICO Figure 2-2.—The Marine Radiobeacon System of the United States, 1949. When first introduced, these installations were called radio fog signals or wireless fog signals because they were originally planned for use in fog; but they have developed, as will be described, into valuable aids in either fog or clear weather. Therefore, the restrictive name, "radio fog signal," was considered inappropriate. In this country, the direction finding equipment on shipboard nearly always is installed in such a way and the transmitted characteristic signal is such that the navigator himself can conveniently take distinct and easy-to-recog- nize radio bearings. The general problems and practice of navigation are then the same when using radio bearings as they are with visual bearings on lighthouses or other known objects. The practical differences between radio and sight bearings are not differences in principle, but in the availability of the former at much greater distances and under all conditions of visibilty or fog. The radiobeacon is located at a definite point shown on the chart.
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