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

SRU Error (Y): Search craft error based on navigation accuracy.
Strike Team (ST): A unit of resources with a leader and communications.
Surface Drift (d): Vector sum of average sea current, local wind
current, and leeway. Sometimes called Total Drift.
Surface Picture (SURPIC): A printout from the AMVER computer of
predicted position information on participating vessels within a defined
area.
Surface Position: The position of the search object on the earth's
surface at the time of initial distress, or its first contact with the
earth's surface.
Sweep Rate: Number of repetitions per second of the audio modulation
frequency.
Sweep Width (W): The distance on both sides of the SRU where the
probability of detecting a target outside of the sweep width is equal to
the probability of missing a target inside the distance. Measures
detection capability based on target characteristics, weather, and other
factors.
Swell: Condition of the surface caused by a distant wind system. The
individual swell appears to be regular and smooth, with considerable
distance between rounded crests.
Swell Direction: The direction from which a swell is moving. The
direction toward which a swell is moving is called the down swell.
Swell Face: The side of the swell toward the observer. The backside is
the side away from the observer. These definitions apply regardless of
the direction of swell movement.
Swell Height: The height between crest and trough, measured in feet.
Swell Length: Horizontal distance between successive crests, measured in
feet.
Swell Period: Time interval between the passage of two successive
crests.
Swell Velocity: Velocity with which the swells advance with relation to
a fixed reference point, measured in knots.
Tactical Air Navigation (TACAN): An air navigation aid used by suitably
equipped aircraft.
Target: Craft or personnel missing or in distress for which a search is
being made.
Terminal Radar Approach Control Facility (TRACON): FAA terminal ATC