(Ototon: Naiteki Ne no Jutsu) - Sound Release: Inner Sonar Skill
Rank: C
Type: Supplementary
Range: Short-Mid
Chakra Cost: 15
Damage Points: N/A
Description: The user enhancing their hearing by utilizing chakra and enfusing their sound waves from their mouth. With their breathing sound waves emerge and bounce off of objects having them know wherever everything is around them.
A very very neat jutsu. The only problem I've always had with it is that it sort of looks like a jutsu that constantly uses chakra, meaning you wouldn't be able to use chakra for other techniques. On the other hand, I've also looked at mugi's CJ (which is an "upgraded version of this", though differently) and it seems to be more like a passive ability. So that's an issue (it has never been cleared up, and as you know sound needs revamping. Big time.). Now, let's just assume it's passive, what seem to be the biggest advantages and disadvantages? Think outside of the box for a minute here.
Well, since it's about having sound waves colliding with objects and reflect them back to us, something that absorbs vibrations wouldn't revert any info back to us. Basically, anything that distorts the sound waves will mess with the sonar and retrieve no info, or, worse of all, retrieve wrong info. So stuff like, I'd say Dark, Energy base, Wind, etc would block the wave, or stuff like Metal, Sand, or even Water or Earth, would increase or decrease the velocity of wave, which would mess with our reading (Since it requires us to have a stable medium, so we can calculate the distance we are from the objects). Anything that alters the medium will force us to alter the calculations, so we need to have a reference point (Something like air and water, in some temperature degree, will be automatic through our training, but any changes will require us to recalculate). Even if the recalculation is somehow fast (given the user's experience and sound mastery, it still requires the reference point, and a wise opponent would not give it to us. (The most obvious example would be the Mist technique, since it's a shifting water technique, throwing off the calculations, and covers our sight, removing any chance of reference points.
We still get a read, but it's not as accurate. Not that it messes all that much in some cases, but sometimes it can be enough.
Also, if objects are long-range from us, we won't get a read, so it leaves us with a somewhat incomplete read. Another thing is, while it allows us to detect many things around us, including the opponent, it also prevents us from being stealthy, as we will have a constant sound emission telling the opponent where we are.
But still, the ability to be able to know where everything around us is is great. It allows us to feel the battlefield and continue fighting, even if, for some reason, we can't rely on our sight. This should be good against a sharingan user, or even a good way to break through strictly visual genjutsus (as the sound vibrations will pass through the ilusion, alerting us that it isn't real). I guess those are a few of the things I can think of.