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Marker itself might be too heavy to be carried by He. Let alone to be meaningfully controlled from UW.
ScubaDadMiami (Howard Packer) wrote an article appearing in one of the major diving publications (Alert Diver [DAN] I believe) on open ocean signaling methods which refrenced the use of a simple mylar party ballon that could be inflated with helium then tethered by line & sent high enough for radar to detect. I will work on locating the peice later today...
CCR Dive Training, LLC
It appeard in Advanced Diver Magazine, Issue 31, which is available as a single issue back order from their web site, Advanced Diver Magazine.
I remember someone telling me that in the Red Sea people attach old CDs to the top of their SMBs because that it supposed to make them radar reflective or some similar such thing.
Radar reflectivity is a product of many factors including material type, shape, and coating. That's why the Stealth fighter looks so freaky, the aircraft's coating does absorb some radar but for the most part the aircraft's shape reflects very little radar energy back to the source. Conversely. the fuel truck that gasses up that aircraft when it's parked has a Radar Cross Section that's about 11,000 times greater than the aircraft. Think Tweety Bird vs a Jumbo Jet. [SNIP]