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How It Works
In addition to the two main operation modes, the UM425 also provides two differ-
ent "watch" modes which you can activate during any of the two basic modes. In
the watch modes, the radio briefly checks for activity on a specific channel, then
returns to its previous mode.
Watch mode
Triple Watch
Dual Watch
NOTE: You are required to monitor channel 16 whenever your boat is under-
way. You should have either Triple Watch or Dual Watch on at all times.
Normal mode operation
Normal mode monitors whatever channel you select, and you can transmit on
that channel also.
While using normal mode, the display lets you see the following information
(not all indicators will display at the same time):
Transmit power
(1 W or 25 W)
Current channel
is stored in
memory
Status messages
(see the status
message table)
What it does:
Checks for activity
on channels 16
and 9 every two
seconds.
Checks for activity
on channel 16 every
two seconds.
25 Watts INT
Memory
GPS Data OK
Marine Operator
Use it when:
You want to monitor
a channel yet
maintain a watch on
channels 16 and 9.
You want to monitor
a channel yet
maintain a watch on
channel 16.
Channel mode
(USA, CANadian,
or INTernational)
25
13
To turn it on/off:
Press and hold the
button for
16/9-TRI
two seconds.
Change Triple
Watch to Dual
Watch in the setup
menu, then press
and hold the
16/9-
button for two
TRI
seconds.
Current
channel
number
Current channel
name (if the name
is too long, the
name line scrolls)
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