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

monitor, homing, and press channels. The SMC selects SAR-dedicated
frequencies, informs the OSC or SRUs of the assigned frequencies, and
establishes communications between adjacent RCCs and with parent
agencies. The OSC maintains communications between all SRUs and with
the SMC. A primary and secondary frequency in the HF, VHF, or UHF band
should be assigned as an on scene channel.
B. The OSC controls communications on scene and ensures that
reliable communications are maintained. SRUs normally report to the OSC
on an assigned on scene frequency. If a frequency shift is necessary,
instructions should be provided in case communications cannot be
reestablished. All SAR ships and aircraft in maritime areas should
carry a copy of the International Code of Signals (Defense Mapping
Agency Hydrographic Topographic Center Pub 102), which contains
communications information internationally recognized by aircraft,
vessels, and survivors.
C. Armed Forces, Civil Air Patrol, or CGAUX aircraft should use
the word "rescue" in their call sign when priority handling is critical.
The use of rescue in the call sign for ATC communications should be
arranged locally between aviation units and ATC authorities. SRUs
initially checking in with the OSC should use their full plain-language
call sign. Thereafter, search area assignments, such as Alpha-3 or
Bravo-2, should be used as call signs.
331 General Channels
A. Control Channels are used for communications between the OSC
and the SMC. This link may be direct or, if necessary, via a radio
station monitored by the SMC. The SMC assigns control frequencies from
those available in the SAR plan. The control channel should be a
dedicated frequency apart from the on scene frequency.
B. On Scene Channels are used between SRUs and the OSC. The SAR
Coordinator lists the available on scene frequencies in the SAR plan;
3-7