Uniden UM425 VHF DSC 사용자 설명서

You should familiarize yourself with the rules on marine radios and be aware 

of which rules apply to your boat. 

The following information is sourced from the Australian Maritime Safety Authority's 

DSC FAQ.

In Australian waters, VHF DSC is for ship-to-ship alerting. There is no official 

shore-based infrastructure but there are a number of volunteer marine rescue 

(VMR) stations that have installed VHF DSC and a check with your local 

VMR should be made.

VHF DSC for small craft is primarily for distress, urgency and safety 

purposes.

In Australian waters, Channel 70 should be used for DSC distress alerts only. 

Once an alert has been sent the party in distress should monitor Channel 

16, the distress and calling channel. Parties receiving the DSC distress alert 

should switch to Channel 16 and acknowledge the MAYDAY call by voice 

giving their identity and signalling “Received MAYDAY”. If the party in distress 

does not receive an acknowledgement to their DCS alert they should transmit 

the standard MAYDAY call by voice on Channel 16. There are still quite a 

number of boats that do not carry DSC radios.

Because Channel 16 is the distress and calling frequency it should only be 

used for general traffic to raise another party. Once contact has been made, 

all routine traffic should be passed on another agreed VHF channel.

An MMSI is a unique nine-digit code set into your DSC terminal to identify 

your vessel. You need only one of these if you have multiple DSC radios. You 

use the same MMSI for all radios on board the one vessel as it is a ship’s 

identity. Because VHF radios now operate under a Class License there is 

no requirement for an official call sign but an operator must have a Maritime 

Radio Operators Certificate of Proficiency (MROCP).

UM425 VHF OM.indd   64

28/9/11   11:55:23 AM