. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. CONSIDERATIONS INVOLVED IN THE SELECTION AND INSTALLATION OF A MERCHANT MARINE RADAR Two factors are most important in selecting a merchant marine Radar: (1) the use to be made of the equipment, (2) the installation problem en- countered on the ship to be equipped. Commercial Radars have been pur- posely designed to be somewhat versatile and some compromises have been necessary. Due, however, to the many factors involved in the design of any Rad
. Electronic navigational aids; loran, radiobeacon, and radarbeacon systems and loran, radio-direction-finder, and radar ship equipment. Loran; Radar. CONSIDERATIONS INVOLVED IN THE SELECTION AND INSTALLATION OF A MERCHANT MARINE RADAR Two factors are most important in selecting a merchant marine Radar: (1) the use to be made of the equipment, (2) the installation problem en- countered on the ship to be equipped. Commercial Radars have been pur- posely designed to be somewhat versatile and some compromises have been necessary. Due, however, to the many factors involved in the design of any Radar equipment, each type offers certain advantages. It is the purpose of the advisory specifications to outline the characteristics considered desirable for various commercial shipboard applications. The following paragraphs, therefore, are intended to point out the considerations involved in the selection and installation of a commercial-type Radar, and to indicate the reasons for some of tlie requirements contained in the advisory specifications. RESOLUTION: Owing to the type of presentation on a PPI scope, resolu- tion is divided into two components: resolution in range and resolution in bearing. Resolution in range is the ability to distinguish between two targets on the same bearing and closely spaced in range. (See fig. 4-2.) Resolution in bearing is the ability to distinguish between two targets at the same range having slightly different bearings. (See fig. 4-3.) RANGE RESOLUTION. C^O^:::!^ i: |« TMAM 'oo yttt. A PIPS ON SCOPE ARE BLENDED TOGETHER WHEN DISTANCE IN RANriF BETWEEN SHIPS IS LESS THAN DESIGNED RESOLUtIoN FOR RANGE. 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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