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
The first uses Figure 5-6, entering with wind history and forecasts for the incident area. The second uses historical data or local knowledge of wind currents. Wind currents need not be computed for coastal, lake, river, or harbor areas, but should be determined for water depths greater than 100 feet (30 meters) and distances greater than 20 miles (32 kilometers) from shore. 2. Wind observations should be obtained beginning 48 hours before the assumed time the distressed craft began drifting. Accuracy of calculation is less with shorter wind histories. Forecasts should be used through the time period containing datum. On scene wind data should agree with the general circulation shown on area surface weather charts; if it does not, it should be either confirmed or disregarded. Generally, surface winds are directed 20 degrees toward the low pressure side of isobars on surface weather charts. a. Wind history is wind speed and direction near datum for the previous 48 hours, divided into 6-hour periods. Period 1 is the most recent 6 hours, period 2 the next most recent, and so on. Because wind observations are often available only at normal synoptic hours (0000Z, 0600Z, 1200Z, and 1800Z), it is best to select the wind interval that begins and ends midway between the synoptic hours bracketing the reported wind time. All other wind intervals also begin and end midway between normal synoptic hours. b. For each period, wind speed and direction are determined by using observed wind for the midpoint of the time period. When hourly winds are available, average wind speed over the time period is used. Wind speeds must be averaged vectorially. 3. Wind current computation involves the following considerations: a. Wind current should be calculated in 48-hour periods made up of subperiods of 6 hours 5-8
Figure 5-6A. Wind Current - North Latitudes Figure 5-6B. Wind Current - South Latitudes 5-9
- Page 79 and 80: vessels) will be required to carry
- Page 81 and 82: . Non-compliance with FCC Rules and
- Page 83 and 84: 9. SART. 10. MF DSC, used to initia
- Page 85 and 86: 4. FAA Domestic Teletype Networks,
- Page 87 and 88: 3023 kHz (USB), 123.1 MHz, and 282.
- Page 89 and 90: 3. 2638 kHz, all areas. 4. 2738 kHz
- Page 91 and 92: SRUs and agencies. A search action
- Page 93 and 94: 2. Rescue Area f. SRUs on scene a.
- Page 95 and 96: extended time, a Notice to Mariners
- Page 97 and 98: The receiving and recording of info
- Page 99 and 100: case. The SMC is often automaticall
- Page 101 and 102: any source. b. There is suspicion t
- Page 103 and 104: The craft's float or flight plan is
- Page 105 and 106: Figure 4-1. Water Chill Without Ant
- Page 107 and 108: s Figure 4-2. Wind Chill Graph - Eq
- Page 109 and 110: 445 Weather A. Weather may limit SA
- Page 111 and 112: 451 Uncertainty Phase An Emergency
- Page 113 and 114: 471 PRECOM A. PRECOM search contact
- Page 115 and 116: the objective during their normal o
- Page 117 and 118: effective search plan. The plan may
- Page 119 and 120: D. Other SAR planning models, such
- Page 121 and 122: 1. The aircraft glide area shown in
- Page 123 and 124: Figure 5-3. Vector Plots of Surface
- Page 125 and 126: TABLE 5-1. Parachute Drift Distance
- Page 127 and 128: the search object has, the greater
- Page 129: B. Sea Current (SC) is the residual
- 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
Figure 5-6A. Wind Current - North Latitudes<br />
Figure 5-6B. Wind Current - South Latitudes<br />
5-9
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