3.3.5 Fog Horn Mode
The [FOG] key allows the user to alternately select one of the automatic or manual FOG output
signals. There are 9 kinds of alarms. They are: MANUAL, UNDRWY, STOP, SAIL, TOW,
ANCHOR, AGROUND, YELP and ALARM. Whenever the [FOG] key is pressed, the alarm type is
changed in the following order:
A. MANUAL — This lets the hailer serve as a horn for the vessel to permit manual horn signals as
described in the ‘Rules of the Road’ - Section 35.
Usage: Passing Signals, etc.
“MANUAL’ appears in the mode display window.
In this mode, the horn sounds when you press the microphone [PTT] button. The length and
timing of the horn blasts are controlled by depressing the push-to-talk switch on the microphone.
Example:
B. UNDRWY (Fog 1) Usage: Power Boat “UNDERWAY’
This is a programmed automatic fog signal for powered vessels underway. The message
“UNDRWY” appears on the mode display window. While operating the [FOG] key, “FOG 1
appears on the station display window for reference.
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