DSC is a critical equipment for boats
DSC means that Digital selecting calling is a stand for transmitting pre-defined digital messages via the MF, HF, or VHF maritime radio systems to replace a voice call in older procedures, which is a core part of the GMDSS.
DSC signal is stable and has no squelch, so the communication distance is longer than the analog signal. And the transmit speed of the DSC signal is also significantly faster.
DSC senders are programmed with the ship’s MMSI and may be connected to the ship’s global positioning system, which can locate the ship’s position very well.
Generally, there are two main types of DSC controller used by ships, VHF and MF/HF DSC. For VHF, DSC has its own dedicated receiver for monitoring CH-70, however, for the MF/HF DSC,
the transceiver is ofen monitor multiple distress and urgency bands in the 2, 4, 6, 8 bands. The biggest difference between the two controllers is the number of monitoring channels,
in comparison, VHF controller operation and equipment requirements are lower, while MF/HF is more secure and equipment requirements are high, need a receive-only antenna and separate tuner to monitor user-defined DSC frequencies. When you encounter a dangerous situation, you can send a DSC signal for help. The DSC device will send the ship’s MMSI, what time it is, and where it is,
if necessary, the channel for the following radio messages. The distress signal can be sent either as a single frequency for the VHF controller or a multi-frequency attempt for MF/HF controller.
Either way, the channel can only be sent on one frequency, and surrounding ships or coast stations need to monitor the communication and respond.
If the distress message is not monitored or received in time, the signal sent will be useless.
When the surrounding ships or coast stations receive the DSC distress alert, they will quickly carry out rescue measures and rush to the place of distress for rescue.
Therefore, the DSC controller is the necessary electronic equipment for ships or boats to go to sea.
