JP 3-50 National Search and Rescue Manual Vol I - US Navy

Sweep widths should be approximated, using the operator's best
estimate of effective detection ranges for other target types and field
of view/scan width limits. Operators should be told the effective
detection range is the range at which they believe the target will
certainly be detected under prevailing conditions. Sweep width should
not exceed the effective azimuthal coverage of the FLIR system in use,
regardless of target size. Figure 5-17 illustrates a means of
estimating sweep width.
G. Multisensor Sweep Widths
1. Environmental parameters limit all types of search methods.
Multisensor searching, both sensor and combinations of sensor
and visual, can be used to mitigate environmental limitations.
Table 5-14 outlines various ways in which radar, infrared, and
visual searches can be combined to complement each other and
possibly overcome some environmental conditions.
2. Sweep width tables for various combinations of search sensors,
based on the type of conditions, type of target, and sensors
used, are presented in Vol. II, Chapter 4.
3. Combined sensor searches should be planned so that sensor
capabilities complement each other. Search patterns and track
spacing should be selected on the basis of the effectiveness
of the different SRU sensors available. The most effective
sensor should be favored and controllable parameters, such as
speed and altitude, should be selected to maximize the
performance of the most capable sensor.
4. Multisensor searches are normally assigned only if they
provide the maximum sweep width possible with the available
personnel. Scanners should not be manning sensors ineffective
for the search conditions if they might be used as visual
scanners.
5. Visual searching may supplement sensor coverage by filling in
blind zones created by antenna configuration and physical or
operational limitations of the electronic equipment.
536 Coverage Factor (C)
Coverage Factor (C) is a measure of search effectiveness or
quality. It is used as an entering argument when calculating POD. In
SAR action
5-26