40F5 D
 How can vessel personnel detect the operation of a SART in its vicinity?
A. A unique two-tone "warbling" signal heard on VHF-FM Ch-70.
B. It will activate an AIS new signal alarm on the AIS receiver. 
C. The SART signal appears as a target that comes and goes--due to the effect of heavy swells on a SART.
D. A unique 3-cm signal consisting of a 12-dot pattern radiating outward from a SART's position along its line of bearing.
