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Page 33GX5500S
TYPE PATTERN USAGE
120s
Listen Back
5s 5s
2s 2s
120s
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1s 1s1s 1s
2s 2s2s 2s
120s
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1s 1s1s 1s1s 1s
2s 2s2s 2s2s 2s
120s
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60s
Listen Back
60s
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UNDERWAY
STOP
SAIL
TOW
AGROUND
ANCHOR One 5-second rings every 60 seconds.
One 5-second blasts every 120 seconds.
Two 5-second blasts (separated by 2
seconds) every 120 seconds.
One 5-second blasts followed by two 1-
second blasts (separated by 2 seconds)
every 120 seconds.
One 5-second blasts followed by three 1-
second blasts (separated by 2 seconds)
every 120 seconds.
One 11-second rings every 60 seconds.
Motor vessel underway and
making way.
Motor vessel underway but
stopped (not making way).
Sailing vessel underway, fish-
ing vessel (underway or an-
chored), vessel not under
command, a vessel restricted
in her ability to maneuver (un-
derway or at anchor), or a ves-
sel towing or pushing another
ahead.
Vessel under tow (manned).
Vessel is aground.
Vessel is at anchor.
FOG HORN TIMING CHART