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Admittedly, I came up with the idea while reading Tress. But before you report this post and transfer it to the Tress Cosmere spoilers area, let me say that I fully intend to avoid Tress spoilers here. and tLM spoilers, too. This is something that could be thought out after BoM release - and perhaps someone thought it out and I'm just an idiot. Anyway, Cosmere-wide there are immediate (or nearly immediate) communication devices. But they don't exist everywhere and work based on an odd system, so I'm going to ignore them - hence why it belongs here, and not in general Cosmere discussion. Anyway, here's the thing: wireless communication is built on sending a signal somewhere and having someone receive it. Said signal, with things like phones, is usually electromagnetic waves of certain frequencies, modulated to carry certain pieces of data somehow. I'm not really an expert, though I've worked with communication devices throughout my IDF servitude. Either way, is there something in allomancy that is known to send and receive some sort of signal? One that could be used for, say, locating people because they send this signal? I'm talkiing about Seekers, of course, I mean, Allomancy in general, but Seekers can receive signals. And they also send them. And due to the fascinating usages of ettmeteal/harmonium, one could make a device that sends and receives Allomantic signals. Now, this is still a simplified version, and the signal is moving in all directions - though clever usage of aluminum when necessary could change that. And it's not really necessary - our phones send signals everywhere. The biggest problem will be modulation - can be solve via using different metals and/or flaring them, perhaps. Oh, and those devices just might cause Seekers constant headaches when burning their metals. This will bring forth a whole new usage for the internal mental metals - one thing that wasn't really seen in the era 2 books, unless the phone/radio we've seen was working on similar principles, which I highly doubt. So, what do you think? A workable idea, something you've seen before and I've missed somehow, or a completely stupid idea?