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F.5.a.  Assistance Request Initiation
 To initiate a request for assistance, the surface vessel is circled at least once.  Additional circling may be necessary to obtain the attention of the surface crew.  This can be verified when members of the surface crew are observed to be watching the maneuvers of the aircraft.
After circling the vessel at least once, the aircraft is flown across (perpendicular to) the vessel’s projected course while opening and retarding the throttle, rocking the wings or cycling the propeller pitch.  Next, the aircraft is flown outbound in the direction that the surface vessel is to take.  If the surface vessel does not respond, the procedure should be repeated.
 
F.5.b.  Surface Vessel Declination
 The surface vessel should also be observed for signals indicating that it cannot or will not accept the directions.  Be alert for other signals such as a wave-off or the surface-to-air signal for “negative”.
Another possible signal for a vessel to indicate “no” when underway might be to swing the bow of the vessel left and right in the manner of the aircraft maneuver of “negative”.  Obviously, if the surface vessel displays no reaction or response to repeated signal attempts, this should be accepted as tacit refusal of the directions, and other available means of obtaining the desired action should be pursued.
 
F.5.c.  Surface Vessel Acceptance
 When a surface vessel does accept the directions, it will often be signaled by picking up the desired heading.  As the aircraft will be traveling at a much higher speed, it can circle back to the vessel periodically and pass close by while flying in the direction of the desired course.  This technique can be used to verify the correct course is being followed and/or for indicating corrections in the course for the surface vessel.  When the target seems to be in visual range of the assisting vessel, the aircraft then circles the target to serve as reference to the surface vessel.  This same technique can be used to steer a vessel around an unseen hazard.  The aircraft should circle at waypoints until the vessel arrives, then indicate the new course.
 

 
F.5.d.  Aircraft No Longer Requires Assistance
 If the conditions change during the operation freeing the vessel from danger, or other reasons develop such that the aircraft no longer desires the surface vessel to follow the course indicated, the aircraft should be flown close astern of the surface vessel at low altitude while changing the engine sound (by throttle or prop control) or rocking the wings until the vessel indicates understanding of the cancellation.  The aircraft is then free to break contact.
 
F.6.  Message Drops
 Message drops are used for communication with surface craft or persons in distress.  Aircraft must be certified in writing by the ASCO before deployment of any SAR device such as a drop message.  Air crews so certified must practice regularly to maintain proficiency and accuracy in deploying message drops or any other SAR device.  (see the Auxiliary Operations Policy Manual, COMDTINST M16798.3 (series))
　
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