Furuno FM-8800D - Manual (Page 22)

1. OPERATIONAL OVERVIEW
1-10
1.2.8 Quick selection of CH16
Press the CH16 key to select CH16, the International Calling and Safety
Channel. The use is limited to distress, safety and calling. The transmission on
CH16 (156.800 MHz) should be limited to within 1 minute except for distress
calling.
Avoid calling on CH16 for purposes other than distress, urgency and very brief
safety communications when another calling channel is available.
Note: When you put the handset on the handset hanger, the channel changes to
CH16 in the default setting. See page 4-17 for details.
1.2.9 Dual watch
The dual watch function permits watch on CH16 and another selected channel.
CH16 and another channel are watched at intervals of 0.15 seconds and one
second, respectively.
To start dual watch, first select the other frequency to watch and then press the
SHIFT key and 9 DW key in that order. When the receiver finds a signal on
CH16, it locks on it and restarts dual watching after the signal on CH16 has gone.
If another channel has traffic, it still continues dual watch. The speech is heard
intermittently.
To stop the dual watch function, do one of following four methods.
a) Press the CH16 key.
b) Press the CANCEL key.
c) If a handset is on-hook, off-hook it.
d) If a handset is off-hook, press the PTT switch. In this case, press the PTT
switch again to transmit.
Note: The dual watch function is not available for INLAND-W mode.
1.2.10 Scanning
The receiver scans all channels at intervals of 0.15 seconds in the selected
channel mode in ascending channel order, watching CH16 between channels as
below:
1 16 2 16 3 16 4...
16 88 16 87 16 86 16...
To start scanning, press the SHIFT and 8 SCAN in that order. When the receiver
finds a signal, scanning is stopped on that channel and starts dual watch on it
and CH16.