Uniden UM425 English Owners Manual - Page 29

Using Digital Selective Calling (DSC) Features Using Digital Selective Calling (DSC) Features What is DSC? Digital Selective Calling or DSC is a standard that allows you to call other stations using their unique identification code (the Maritime Mobile Service Identity or MMSI number), just like you would call a phone number. To call another station, just enter that station's MMSI number and choose the voice channel you want to talk on. The radio uses channel 70 to transmit your MMSI number to the other station along with the voice channel you requested. If the other station accepts your call, both radios automatically switch to the requested voice channel so you can talk to the other station. DSC provides a system for automated distress calls. At the touch of a button, the radio can transmit your MMSI number, the nature of your distress, and your current position based on data from your GPS receiver. The radio repeats the distress call every few minutes until it receives an acknowledgement. The DSC standard dedicates a VHF channel-channel 70-to digital transmissions only. Since digital transmissions require less bandwidth voice transmissions, channel 70 avoids the problems of busy voice channels. Advanced DSC features The UM425 supports the following DSC features: Feature Menu Item Function Individual Call Individual Contact another vessel from your directory. Group Call Group Contact all vessels that share your group MMSI code. All Ships Call All Ships Broadcast to all vessels within range (used for safety or advisory messages.) Position Request POS Request Request the current location of another vessel. Position Send Position Send Transmit your current location to another vessel. Test Call Test Make sure your radio is working and configured correctly Name and MMSI Directory Directory Store a list of 20 names and MMSI identification codes for DSC calls. Standby Mode Standby Automatically respond to all DSC calls with an "Unavailable" status. Received Call Log Receive Log Display the last 10 distress calls received by the radio and the last 20 general calls. E-25