environment for the marker until the last possiblemoment before launch. Because of the physicaldifference in size between the Mk 25 marker and thesonobuoy launch tubes, a sonobuoy launch container(SLC) and spacer assembly (fig. 4-8) is used to launchthe Mk 25 marker from a sonobuoy launcher.The Mk 25 marker, with the Mk 34 adapter kitinstalled, is installed into the cavity half of the splitfoam spacer assembly section with the U-pin of the Mk34 adapter in the UP position. Then, remove the U-pinand place the other half of the split foam spacerassembly section over the marker, which completelyencloses the marker. The foam spacer assemblycontaining the marker is then installed into the SLCagainst the obturator. Foam pads are installed, and theend cap is locked into slots in the SLC, retaining theassembly inside the SLC. A JAU-1/B cartridge isinstalled in the SLC, and the loaded SLC is installed inthe sonobuoy launcher aboard the aircraft.To launch the Mk 25 marker, the JAU-1/B cartridgeis initiated through the aircraft circuitry. It developssufficient gas pressure inside the SLC to force off theSLC end cap and expel the foam spacer assemblycontaining the Mk 25 marker. Once out of the SLC, thesplit foam spacer assembly is separated by theairstream, freeing the marker. The airstream thenseparates the Mk 34 adapter kit from the marker,allowing them to fall to the water as separate units.Upon entry into the water, the marker functions aspreviously discussed.MK 58 MOD 1 MARINE LOCATIONMARKERThe Mk 58 Mod 1 marine location marker (fig. 4-9)is designed for day or night use in any condition callingfor long-burning, smoke and flame reference-pointmarking on the ocean's surface. In addition to beingused for antisubmarine warfare, it is used forsearch-and-rescue operations, man-overboard mark-ings, and as a target for practice bombing at sea. Themarker produces a yellow flame and white smoke for aminimum of 40 minutes and a maximum of 60 minutes.It is visible for at least 3 miles under normal operatingconditions.4-10Figure 4-9.—Mk 58 Mod 0/1 marine location marker.
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