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

TABLE E-1. Correction to Course Table
Degrees of turn for
Distance off Course (miles) TAS110 TAS120 TAS130 TAS140 TAS150
0.25 ................. 24 23 22 21 20
0.50 ................. 42 40 38 36 34
0.75 ................. 56 52 50 47 44
1.00 ................. 68 64 61 57 55
1.25 ................. 78 74 71 67 65
1.50 ................. 86 82 79 76 73
prescribed in the "Correction to Course Table," and
immediately reverses the turning direction to return to the
searchleg heading. All aircraft correction turns are standard
rate turns. The aircraft should be instructed to visually
correct as necessary in order to pass over the ship on each
inbound leg.
d. When the aircraft arrives where it should begin the
turn onto the crossleg, the controller directs the pilot to
turn. The aircraft turn point is short of the end of the
searchleg by a distance of one-half its turn diameter, usually
15 seconds of flight time. The air controller must allow for
the lag between the turn command and the actual turn, so most
controllers mark the relative plot and true plot with TTT
marks at a distance equal to one-half TD + 0.3 mile from the
end of the searchleg. No position or off course advisories
are passed to the aircraft while it is executing its crossleg.
e. If during the search the aircraft repeatedly drifts
off the search course in the same direction, the wind at
search altitude is different from that used to originally
compute the aircraft headings. A more accurate wind should be
estimated from the plot fixes, or obtained from the aircraft,
and the aircraft headings replotted. The correct heading
advisory is passed to the pilot.
f. If the aircraft breaks off the search to investigate
a sighting, it is advised that the vessel will hold relative
position in the pattern by either stopping or circling present
position. If the report proves negative, the vessel will
vector the aircraft back to the last position in the pattern.
4. Range and bearing information
a. The CSR search pattern is the same as the CSC pattern
except that the vessel assists the aircraft with keeping on
the proper search course by furnishing frequent advisories
based on the ship's radar/visual plots of the aircraft. The
vessel normally maintains a true plot and a relative plot.
Both are a composite of information from air search radar,
surface search radar, IFF/SIF interrogator displays, ECM