. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. 50 OCEAN ELECTRONIC NAVIGATIONAL AIDS. Figure 4—7.—PPI picture showing portion of sea area (left-hand portion of picture) obscured by a heavy rain squall which is local in nature (special 3 cm. Radar). (4) Certain types of objects, because of their characteristics or motion, may go undetected. For example, the Coast Guard's study of Radar detection of floating ice has revealed that while icebergs can ordinarily be observed, pieces of ice large e
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. 50 OCEAN ELECTRONIC NAVIGATIONAL AIDS. Figure 4—7.—PPI picture showing portion of sea area (left-hand portion of picture) obscured by a heavy rain squall which is local in nature (special 3 cm. Radar). (4) Certain types of objects, because of their characteristics or motion, may go undetected. For example, the Coast Guard's study of Radar detection of floating ice has revealed that while icebergs can ordinarily be observed, pieces of ice large enough to damage a ship may go undetected. Ice and some other things, therefore, due to physical characteristics and reflecting properties, are rela- tively poor targets. A low-lying point of land is another example of a relatively poor target. The motion of small objects, such as small buoys and boats, caused by bobbing up and down in a seaway tends to reduce the echo returned to the Radar. These considera- tions become particularly important when such things as sea return and rain, are present to reduce the Radar visibility. While Radar has limitations, its advantages more than compensate for these limitations. The distinct operational advantages are summarized below: (1) It is the best anticollision device yet perfected. (2) It makes for greater safety while piloting or making landfalls during ' periods of low Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Coast Guard. Washington, U. S. Govt. Print. Off.
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