Figure 6-6.The Mk 58 Mod 1 marine location marker.
sealed with tape. The pull-wire ring, also at the emission
end, is also covered with tape.
The Mk 6 signal has a direct-firing ignition system.
Ignition results from pulling the pull ring. The pull ring
is pulled by hand, and the device is thrown into the water
immediately. The pull wire ignites a 90-second delay
fuse that ignites the quick match at the top of the first of
four candles. The quick match ignites the first candle
starting mix, which, in turn, initiates burning of that
candle. Expanding gases of combustion force the cap
and tape from the emission hole, allowing smoke and
flame to be emitted. When the first candle is nearly
burned out, a transfer fuse carries the ignition to the
quick match of the next candle in series. This process
continues until all four candles have burned. The yellow
flame and gray-white smoke are produced for at least 40
After the tear-strip on the shipping container has
been removed, the following rules apply:
1. The tape over the pull ring should not be
disturbed until immediately before hand-launching the
signal. This tape not only prevents an accidental pull on
the pull ring but also protects the igniter assembly from
moisture, which might render the signal useless.
This signal is initiated by the physical
movement of a friction wire through ignition
compound. Extreme care must be taken to
prevent tension of the pull ring during all
2. If this device is prepared for launching and is not
launched, the pull ring should be securely retaped into
position at the top of the signal without exerting any
pulling force on the pull-wire igniter.
3. Under no circumstances should these signals be
stowed or restowed with their pull rings exposed or with
any wires, strings, or other material of any kind joined
to their pull rings.
All safety precautions pertaining to this signal must
be observed. In addition, the following specific rules
Do not remove the tape over the pull ring until
immediately before launching.
The Mk 6 signal should be thrown over the side
immediately after pulling the pull ring. This device