. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . Figure 1-4.—Ground wave and sky wave paths. imaginary line between the two stations, or "base line", a line of position may have an accuracy of the order of several hundred feet. This feature has par- ticular practical value, inasmuch as the physical arrangement of Loran sta- tions is such that a navigator making a landfall usually will approach the shore in this highly accurate area of Loran service. Figure 1-5 shows the pattern that a family of L
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment . Figure 1-4.—Ground wave and sky wave paths. imaginary line between the two stations, or "base line", a line of position may have an accuracy of the order of several hundred feet. This feature has par- ticular practical value, inasmuch as the physical arrangement of Loran sta- tions is such that a navigator making a landfall usually will approach the shore in this highly accurate area of Loran service. Figure 1-5 shows the pattern that a family of Loran lines of position make with respect to their transmitting stations and points out the regions of accuracy. Figure 1-6 shows a vessel approaching a harbor along a line of position. Another important feature of Loran to the navigator is the reliability of the signals and the consequent removal of doubt in the navigator's mind as to the dependability of Loran fixes. Loran signals can be received under all ordinary conditions of storms, gales, and other severe weather. This is possible because the ordinary electrical interferences that accompany these conditions obscure the Loran signal for only a few seconds at a time and the
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