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
uniform coverage of the search area. See Figure 5-29. Figure 5-29. 5. Parallel Track Single-Unit LORAN (PSL) is one of the most accurate search patterns for searching areas covered by LORAN, OMEGA, or similar navigational systems. The pattern must be oriented so legs flown by the SRU are parallel to a system of LORAN lines, OMEGA lines, and so on. LORAN lines are selected at the track spacing desired. As each leg is flown, the selected line reading is preset on the receiver indicator. The letter "L" in the third position is used to indicate. See Figure 5-30. Figure 5-30. 6. Parallel Multiunit Circle (PMC) is used by two or more swimmers for underwater search of small areas, generally less than 25 yards in diameter. A line or rope is knotted along its length at distances equal to the track spacing. The line is anchored in the center of the area and swimmers use the knots to maintain uniform spacing, beginning with the innermost knots for one set of circles, then shifting outward to the next set of knots. See Figure 5-31. 7. Parallel Single-Unit Spiral (PSS) is used by a single underwater swimmer for search of small areas, generally less than 25 yards in diameter. The swimmer uses a line coiled on a fixed drum in the center of the area, and swims in everincreasing spirals, using the line to maintain proper track spacing by keeping it taut. See Figure 5-32.
Figure 5-31. Figure 5-32. D. Creeping Line Patterns (C) are a specialized type of parallel pattern where the direction of creep is along the major axis, unlike the usual parallel (P) pattern. They are used to cover one end of an area first, or to change direction of the search legs where sun glare or swell direction makes this necessary. 1. Creeping Line Single-Unit (CS). The CSP is located 1/2 track spacing inside the corner of the search area. See Figures 5-33. 2. Creeping Line Single-Unit Coordinated (CSC) is used when aircraft and either vessels or boats are available. The aircraft track is planned so that advance of successive legs of the search pattern equals that of the marine craft, and the aircraft passes over the vessel on each leg. This results in a more accurate search pattern, and enables 5-37
- Page 131 and 132: Figure 5-6A. Wind Current - North L
- Page 133 and 134: large lake can vary with season, we
- Page 135 and 136: 5. Other on scene observations can
- Page 137 and 138: 520 SEARCH AREA Figure 5-8. Minimax
- Page 139 and 140: Figure 5-9. Drift Error by Minimax
- Page 141 and 142: DRe to determine SRU error (Y = Fix
- Page 143 and 144: Figure 5-11. Search Areas - Moving
- Page 145 and 146: E. When only a datum area exists, s
- Page 147 and 148: SRUs are dispatched next. Supplemen
- Page 149 and 150: B. POD can be increased by decreasi
- Page 151 and 152: C. Visual sweep widths are determin
- Page 153 and 154: TABLE 5-6. Visual Sweep Width Estim
- Page 155 and 156: 9. Fatigue. Degradation of detectio
- Page 157 and 158: Table 5-8. Height of Eye vs. Horizo
- Page 159 and 160: 6. Sweep widths for Side-Looking Ai
- Page 161 and 162: TABLE 5-11a. Sweep Widths for Forwa
- Page 163 and 164: Sweep widths should be approximated
- Page 165 and 166: TABLE 5-14. Environmental Limitatio
- Page 167 and 168: Figure 5-19. Maritime Probability o
- Page 169 and 170: again, unless it is determined furt
- Page 171 and 172: c. This track spacing may exceed th
- Page 173 and 174: a. E-7 corners 23 15N 74 35W to 23
- Page 175 and 176: E. Orienting Search Areas Search pa
- Page 177 and 178: Figure 5-21. Typical Assignments fo
- Page 179 and 180: The major pattern characteristic is
- Page 181: Figure 5-26. Figure 5-27. 3. Parall
- Page 185 and 186: area, they must fly their individua
- Page 187 and 188: for large objects in well-defined s
- Page 189 and 190: I. Homing Patterns (H) are used to
- Page 191 and 192: completed, the initial area, not th
- Page 193 and 194: Pattern Name SRU required Remarks T
- Page 195 and 196: 560 PLANNING OF ON SCENE COORDINATI
- Page 197 and 198: NOTAM for non-SAR aircraft to remai
- Page 199 and 200: described as previously discussed,
- Page 201 and 202: procedures for aircraft SRUs should
- Page 203 and 204: 1. Where sea current, tidal current
- Page 205 and 206: eturn to base. E. Continuous attent
- Page 207 and 208: to minimize clutter. While this is
- Page 209 and 210: 642 Aircraft Search A. Overwater Se
- Page 211 and 212: one leg to the next without the nee
- Page 213 and 214: everses course. The course on which
- Page 215 and 216: 645 Scanning Figure 6-5. Search for
- Page 217 and 218: Figure 6-6. Marine SRU Crossleg Fig
- Page 219 and 220: a. The effects of time on task vary
- Page 221 and 222: Figure 6-9. Range Estimation 6-12
- Page 223 and 224: 5. Scanners forced to look into the
- Page 225 and 226: 645 Search Target This effect can b
- Page 227 and 228: Figure 6-12. Effects of Altitude on
- Page 229 and 230: Figure 6-16. Factors in Radar Detec
- Page 231 and 232: C. Multisensor search is either mul
Figure 5-31.<br />
Figure 5-32.<br />
D. Creeping Line Patterns (C) are a specialized type of parallel<br />
pattern where the direction of creep is along the major axis, unlike the<br />
usual parallel (P) pattern. They are used to cover one end of an area<br />
first, or to change direction of the search legs where sun glare or<br />
swell direction makes this necessary.<br />
1. Creeping Line Single-Unit (CS). The CSP is located 1/2 track<br />
spacing inside the corner of the search area. See Figures 5-33.<br />
2. Creeping Line Single-Unit Coordinated (CSC) is used when<br />
aircraft <strong>and</strong> either vessels or boats are available. The<br />
aircraft track is planned so that advance of successive legs<br />
of the search pattern equals that of the marine craft, <strong>and</strong> the<br />
aircraft passes over the vessel on each leg. This results in<br />
a more accurate search pattern, <strong>and</strong> enables<br />
5-37
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