Very High Frequency (VHF) is the GMDSS system important component and it is radio equipment that mainly used in communication between people with risks and nearby rescue groups. It can use all VHF channels that are assignment for the international marine mobile service. When the emergency encounters to be possible transmits the distress signal to other ships or the sea patrol leader in 16 channels.

Frequency range:  154-163MHzChannel spacing: 25kHz (12.5kHz optional)Operating temperature: -20°C to +55°CSensitivity: 1μV for 20 dB SINADAdjacent channel power: >70 dBBlocking: >90 dBSpurious response: >70 dBHarmonic distortion: <5%Intermodulation rejection: >68 dBRF output power: 1W (Lo)/2W (Hi)Frequency error: <+1.5kHzCase Size (W x H x D): 2.20” x 5.24” x 1.08” (56 x 133 x 27.5 mm)           (w/o knob & antenna)Weight (Approx.): 280 g