how to use vhf digital selective calling

VHF Digital Selective Calling (DSC) is a radio communication method that uses the very high frequency (VHF) dedicated frequency band to transfer communications between ships, between ships and shores, or via shore stations and land. It is a Global Maritime Distress Safety System (GMDSS) one of the core parts. To use VHF DSC, you need the following steps:

Apply for an MMSI code (Maritime Mobile Service Identity), which is a 9-digit number used to identify your ship and DSC equipment. You can obtain the MMSI code from your country's maritime administration or radio administration.

Enter the MMSI code into the VHF DSC device and follow the device's operating instructions to set it up. If the device has a GPS function or can connect to an external GPS system, you also need to set up your location information so that it can be automatically sent to rescuers in the event of distress.

Keep VHF DSC equipment on continuous 24-hour watch on CH70 (156.525 MHz), which is the dedicated channel for VHF DSC distress and safety calls. Daily communication can also be carried out on other channels, but do not occupy CH70

When you need to make a DSC call, you can select the call object (single station, all ships, groups or sea areas), the call type (distress, emergency, safety or daily), the call content (voice or text message), and the call to be transferred after the call. channel (not CH70). Follow the device's operating instructions, enter the appropriate information, and press the send button

When a DSC call is received, the device will sound a tone and display the call information. If it is a distress or emergency call, you should respond immediately and provide assistance. If it is a security or daily call, you can choose whether to reply and transfer to the agreed channel for voice or SMS communication.

Using VHF DSC can improve the efficiency and reliability of maritime communications, and can also provide timely rescue in times of distress. Hope this information is helpful to you.

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