Physical Description The Mk 58 Mod 1 marine location marker consists of a cylindrical tin can approximately 21.78 inches long and 5.03 inches in diameter. The can contains two pyrotechnic candles of a red phosphorus composition. The ignition end of the marker has three holes—two for smoke and flame emission and one for water to enter the Mk 72 Mod 1 seawater-activated battery. Adhesive foil disks hermetically seal the two emission holes. A reinforced adhesive foil strip with a rectangular pull ring hermetically seals the battery cavity hole. The adhesive foil seals are protected during handling and shipping by a replaceable polyethylene protective cover. Launching Methods The Mk 58 Mod 1 marker may be hand launched, externally launched from suitable aircraft bomb racks by using breakaway suspension bands, or launched from sonobuoy launchers by using a sonobuoy launcher container (SLC) and the appropriate foam spacer. No matter how the marker is launched, the protective cover, the pull ring, and reinforced adhesive foil strip over the battery’s cavity is removed. When   launching   the   marker   from   a   sonobuoy launcher, you remove the protective cover and pull ring and   reinforced   adhesive   foil   strip.   Then,   load   the marker onto the bomb rack. After securing the marker to the bomb rack, attach the pull ring to an arming wire, which is attached to the bomb rack. When the marker is released  from  the  bomb  rack,  the  arming  wire  retains the  pull  ring  and  removes  the  foil  strip  covering  the battery's  cavity.  When  submerged,  the  Mk  72  Mod  1 battery   is   activated   by   seawater.   Current   from   the battery  initiates  a  Mk  13  electric  squib,  which  ignites the starter composition of the first pyrotechnic candle. The  composition  ignites  the  starter  pellet,  which,  in turn,  ignites  the  first  candle.  When  the  first  candle  is nearly burned out, its heat ignites the transfer time fuze, which   carries   ignition   to   the   second   candle   starter composition.   This   starter   composition   initiates   the second pyrotechnic candle. REVIEW NUMBER 3 Q1. What is the burn time of the Mk 25 Mods 2 and 3 marine location markers? Q2. The  Mk  25  Mods  2  and  3  marine  location markers  function  in  the  same  way.  Describe the difference between them. Q3. What  is  the  purpose  of  the  heavy  aluminum base assembly crimped to the outer tube? Q4. List the methods used to launch the Mk 25 and Mods marine location markers. Q5. What adapter kit is used when the Mk 25 and Mods marine location markers are launched from sonobuoy launchers? Q6. List  the  uses  of  the  Mk  58  Mod  1  marine location marker. Q7. The Mk 58 Mod 1 marker produces a yellow flame  and  white  smoke  for  what  length  of time? Q8. Under  normal  conditions,  the  flame  and/or smoke of the Mk 58 Mod 1 marker is visible for ____________. Q9. List  the  methods  used  to  launch  the  Mk  58 Mod 1 marine marker. Q10. What seawater-activated battery is used with the Mk 58 Mod 1 marker? DECOYING DEVICES LEARNING  OBJECTIVE:  Identify  the  pur- pose and use of decoy devices. Decoy flares are dispensed from launching mechanisms on aircraft. They are fired during evasion tactics when threatened by enemy heat-seeking missiles. The Mk 46 Mod 1C decoy flare is loaded into and launched  from  the  AN/ALE-29A,  AN/ALE-37A,  or AN/ALE-39  Dispensing Set for purposes as set forth in 4-11