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Pyrotechnics - 14067_166
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MK 6 Marine Location Marker -Continued
Also, at the end of this section on pyrotechnics, we provide  some  basic  information  on  the  proper  handling and  storage  of  these  devices. MARINE LOCATION MARKERS Marine location markers are used as night or day long-burning reference markings on the ocean's surface. They are dropped over the side from surface ships for man-overboard marking, navigation drills, and other similar  operations.  These  markers  may  also  be  dropped from aircraft for search and rescue operations. The two marine  location  markers  currently  in  use  are  the  Mk  58 and the Mk 6. Mk  58  Marine  Location  Marker The Mk 58 marine location marker is the primary marine  location  marker  found  aboard  surface  vessels.  It is approximately 21 1/2 inches long and weighs about 12 3/4 pounds. It contains a battery squib, some starter mix, two pyrotechnic candles, and a transfer fuse between the two candles. Before launching, the tear tape over the water port must be removed so that seawater can  enter  to  activate  the  battery.  Battery  current energizes the electric squib, which ignites the starter mix, which, in turn, lights the pyrotechnic candle. When the first candle has burned out (in 20 to 30 minutes), the second candle is started by the transfer fuse, for a total burning time of approximately 40 to 60 minutes. The Mk 58 currently is available in two versions: the Mod 0 and the Mod 1. The Mod 0 is a hermetically sealed can, which is opened with a twist key. Figure 6-5 illustrates this marker. The Mod 1 (fig. 6-6) is capped with  a  replaceable  polyethylene  cover. MK  6  Marine  Location  Marker The Mk 6 aircraft smoke and illumination signal (fig. 6-7) is a pyrotechnic device that is launched from surface craft only to produce a day or night floating reference  point.  One  of  its  principal  uses  is  as  a man-overboard  marker.  It  was  previously  approved  for launching   from   low-performance   aircraft   as   a long-burning  marker  but  has  been  replaced  for  this purpose by the Mk 58 marine  location  marker. The Mk 6 signal consists of a wooden body with a flat, die-cast metal plate affixed to one end to protect it from water impact damage and to maintain it in the correct floating attitude. There are four flame and smoke emission holes in the opposite end, each capped and Figure 6-5.–The Mk 58 Mod 0 marine location marker. 6-9

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