Manually Selecting Coast Guard/Distress/ Hailing Channels
In addition to using Triple or Dual Watch to monitor the Coast Guard/Distress/Hailing channels, you can manually select them at any time.
To select your Coast Guard/Distress/Hailing channel, repeatedly press 16/9/TRI. At the first 
press, the radio switches to channel 16, 
the primary Coast Guard/Distress/Hailing channel. 16 appears on the screen. Press 
the button again to switch to channel 9, the
backup calling channel. 9 appears and NON COMMERCIAL appears at the bottom. Press again to return to the standard marine channels.
If you are listening to a weather (WX) channel and you press 16/9/TRI, the radio drops out of weather mode and switches to channel 16 and displays 16. If you are also set to TriWatch, the radio begin to check 9, then 16 then the marine channel in use prior to selecting the weather mode.
Storing a Channel in Memory
Once you have stored channels in memory, you can set the radio to scan those channels for activity. To select and store a channel follow these steps.
1.Use ▲ or ▼ until you reach a channel you want to store.
.Press and hold SCAN/MEM to store the channel in memory. A double beep sounds to confirm your action.
3.CHANNEL STORED appears at the bottom of the display.
4.If you take no further action, the screen returns to the standard marine screen in
32 | Uniden MHS450 Radio Owner’s Manual |