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

(d) Line parallel to ship's course on downwind side
a distance L/2 from plot center. Mark off X and Y
reversed from upwind side.
(e) Connect points through center.
(f) Remove construction line.
4. Air plot data. After the relative motion pattern has been
solved, it is laid out on the air plot. It should then be
covered with transparent plastic tape in lieu of plexiglass,
as the tape will not introduce any parallax errors. The
following information is depicted upon the air plot:
a. Aircraft magnetic courses (box in, cover with
transparent tape).
b. Aircraft wind-corrected headings (above or below box;
do not cover).
c. Magnitude directions every 10 degrees around edge of
plot.
d. Wind direction and speed.
e. Swell systems, labeled primary "P" and secondary "S".
f. Recommended ditch heading, large arrowhead labeled
"DH".
g. Mark on each leg at 5 miles from end.
h. Mark on each leg at TTT leadpoint for turn onto
crossleg.
i. Time on crossleg straightaway (t3).
j. Times for one half of each searchleg straightaway (t1
and t2).
H. Execution of the CSR Search Pattern
1. Basic sequence for vessel:
a. Position vessel one-half track spacing outside of the
arc on the centerline.
b. Start aircraft outbound, in either direction, from
overhead and get under way. Ship will lag pattern slightly on
first leg due to need to accelerate to search speed.
c. Direct the aircraft to correct his track to pass
overhead when within 1 mile of the vessel on each inbound leg.