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Wolf - If you carry a mobile phone you are easy to track because your phone is sending it's signature always when you have it on. If the guys in black suits want they of course can listen to all your phone conversations, and the NSA has computers to break and read all your e-mail (if they know what to search). But then what? Why would they use a lot of resources just to keep track of you (or me)?
I think if you might get to a long lasting survival situation it is better to keep things simple, or at least have foolproof secondary stuff. In extreme cold batteries run down really fast, and some gimmicks get electric problems when it rains etc. I keep iron sights on top of my pistols so I never "run out" of sighting, and wouldn't install to my rifle a sight that doesn't work at all without batteries.
Ossi
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