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

Figure 6-18. INS Pattern for Relocating Survivors
b. An alternative method for aircraft not capable of
rapidly deploying markers is for the observer to call out the
clock position and estimated distance immediately upon
sighting an object. The pilot then immediately turns the
aircraft in the direction of the sighting. The observer
continues to call out the target position and distance to
orient the pilot. As the turn progresses, the pilot or
copilot should state when the target is sighted.
c. Although the use of a marker is the most accurate
method to mark the position of a target, some sophisticated
navigation systems can be used to relocate targets:
(1) When a sighting is called out, SRU position and
distance to go on the current leg is noted.
(2) A racetrack pattern is executed so that the
search leg is intercepted at a point prior to where the
sighting was made.
(3) As the sighting location is approached, the
scanners are notified.
This method should allow the same scanner to sight the
target under similar conditions, improving the chances of
relocation. Aircraft altitude and speed can be changed to
improve identification. The autopilot should be recoupled to
the navigation system prior to each arrival at the sighting
location in time to ensure the aircraft is "on track" when
trying to relocate the sighting. See Figure 6-18.