Standard Horizon VLH-3000A Manual page 13

The fog horn function sounds a horn repeatedly until the function is
turned off.
TYPE
One 5 second blasts every 120 seconds.
UNDERWAY
Two 5 second blasts (separated by 2 sec-
onds) every 120 seconds.
STOP
One 5 second blasts followed by two 1
second blasts (separated by 2 seconds)
every 120 seconds.
SAIL
One 5 second blasts followed by three 1
second blasts (separated by 2 seconds)
every 120 seconds.
TOW
One 11 second rings every 60 seconds.
AGROUND
One 5 second rings every 60 seconds.
ANCHOR
VLH-3000A
FOG HORN TIMING CHART
PATTERN
5s
Listen Back
120s
5s 5s
Listen Back
2s
120s
5s 1s 1s
Listen Back
2s 2s
120s
5s 1s 1s 1s
Listen Back
2s 2s 2s
120s
1s
1s 1s 5s 1s
250ms
11s
Listen Back
60s
5s
250ms
5.25s
Listen Back
60s
5s
5s 5s
2s
5s 1s 1s
2s 2s
5s 1s 1s 1s
2s 2s 2s
1s 1s
USAGE
Motor vessel underway and
making way.
Motor vessel underway but
stopped (not making way).
Sailing vessel underway,
fishing vessel (underway or
anchored), vessel not under
command, a vessel restricted
in her ability to maneuver
(underway or at anchor), or
a vessel towing or pushing
another ahead.
Vessel under tow (manned).
Vessel is aground.
Vessel is at anchor.
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