JP 3-50 National Search and Rescue Manual Vol I - US Navy
JP 3-50 National Search and Rescue Manual Vol I - US Navy JP 3-50 National Search and Rescue Manual Vol I - US Navy
spacing outside of the search area, and vectors the aircraft to the ship and then onto its initial "startup" searchleg. As the aircraft passes overhead the vessel and begins its initial searchleg, the DRT is started, with the ship search speed (Vs) set in. The mechanically controlled DRT produces a twodimensional, lateral movement proportional to the headings and speeds of the ship. Aircraft and vessel positions are marked each minute on the DRT surface plot. The surface plot, or true plot, is used as a backup for the relative motion plot. Although most radar advisories to the aircraft are based on the relative motion plot, the plotted information is removed after each leg is completed. The surface plot provides the only permanent history of the search, so all sightings should be plotted on the surface plot. See Figure E-2. 2. Surface plot data Figure E-2. Surface Plot/True Plot a. Within the coordinated search area, using the largest scale possible, the following information is plotted on the surface plot: ship course, search pattern with searchlegs drawn at proper track spacing (each leg marked at 5 miles from its end and at TTT onto crossleg), coordinates of datum, and time and position of all sightings. b. Plotted within the search areas adjacent to the coordinated search area, are the following: area designation, coordinate of centerpoint, major axis, searchlegs (direction of creep arrow - and the first two or three searchlegs), search altitude, type and call sign of SRU, vector from OSC position to commence search point (CSP), and IFF/SIF squawk and air-to-air TACAN channel assignment. c. Plotted outside the coordinated search area but
adjacent to it, are the following: aircraft radio call sign, aircraft assigned search altitude, assigned track spacing, type of pattern, and times required to fly t1, t2, and t3. G. Air Plot/Relative Plot 1. General a. Although a true plot may be used to plot and vector the search aircraft during coordinated search patterns, an easier method is to employ a relative motion pattern. The relative motion pattern is laid out on the vessel air plot or relative plot board, and is the primary source of information for the advisories furnished the aircraft by the vessel during the search. b. The true plot, or surface plot, is laid out on the vessel DRT in the vessel Combat Information Center (CIC). The vessel relative plot or air plot board is close to the DRT. This board is usually edge-lighted or back-lighted, has permanently inscribed bearing lines and range circles similar to a maneuvering board, and is used to plot aircraft targets relative to vessel position. 2. Relative plot and true plot comparison a. The vessel air controllers should thoroughly understand the difference between the true plot and the relative plot, as well as their relationship. The air controller may have to rapidly shift from using the relative plot to using the true plot if ship radar fails or radar contact with the aircraft is lost. b. With known values for ship course and speed, existing wind direction and speed, length of searchlegs, and track spacing, the relative motion pattern may be computed and laid out by the vessel before the search aircraft arrives. The shape of the relative motion pattern, when executing any of the creeping line coordinated patterns, is similar to a bowtie. c. Figure E-3 illustrates the common-time relative bearings of vessel and aircraft, and Figure E-4 is a simplified form of Figure E-3, showing the relationship between the true plot and relative plot patterns. Only four common time positions are shown for the vessel and aircraft, and aircraft turning diameter is ignored. (1) The comparison is started with the aircraft in position ahead of the vessel, at position 1. The relative bearing of the aircraft from the vessel stays constant until the aircraft E-4
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spacing outside of the search area, <strong>and</strong> vectors the aircraft<br />
to the ship <strong>and</strong> then onto its initial "startup" searchleg. As<br />
the aircraft passes overhead the vessel <strong>and</strong> begins its initial<br />
searchleg, the DRT is started, with the ship search speed (Vs)<br />
set in. The mechanically controlled DRT produces a twodimensional,<br />
lateral movement proportional to the headings <strong>and</strong><br />
speeds of the ship. Aircraft <strong>and</strong> vessel positions are marked<br />
each minute on the DRT surface plot. The surface plot, or<br />
true plot, is used as a backup for the relative motion plot.<br />
Although most radar advisories to the aircraft are based on<br />
the relative motion plot, the plotted information is removed<br />
after each leg is completed. The surface plot provides the<br />
only permanent history of the search, so all sightings should<br />
be plotted on the surface plot. See Figure E-2.<br />
2. Surface plot data<br />
Figure E-2. Surface Plot/True Plot<br />
a. Within the coordinated search area, using the largest<br />
scale possible, the following information is plotted on the<br />
surface plot: ship course, search pattern with searchlegs<br />
drawn at proper track spacing (each leg marked at 5 miles from<br />
its end <strong>and</strong> at TTT onto crossleg), coordinates of datum, <strong>and</strong><br />
time <strong>and</strong> position of all sightings.<br />
b. Plotted within the search areas adjacent to the<br />
coordinated search area, are the following: area designation,<br />
coordinate of centerpoint, major axis, searchlegs (direction<br />
of creep arrow - <strong>and</strong> the first two or three searchlegs),<br />
search altitude, type <strong>and</strong> call sign of SRU, vector from OSC<br />
position to commence search point (CSP), <strong>and</strong> IFF/SIF squawk<br />
<strong>and</strong> air-to-air TACAN channel assignment.<br />
c. Plotted outside the coordinated search area but
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