Furuno FM-2710 - Manual (Page 27)

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If a signal is present on CH16, the receiver locks on CH16 and ignores the other channels. After the signal
has gone, the receiver stays on CH16 for 5 seconds, and then reverts to the Dual Watch mode again.
In the case that a signal is present on the selected working channel, CH16 is monitored momentarily
(for 150 msec ) once in 5 seconds. After the signal has gone, the receiver stays on that channel for 5
seconds, and then reverts to the Dual Watch mode.
To quit the DW mode, simply press any key except [INT] and [1/25]/DIM, or rotate the Channel selector.
USA
DW
BUSY
USA
DW
BUSY
"16" is displayed momenarilly
once in 5 seconds