This jutsu allows the user to place a wide, invisible seal on the ground. This seal can spread for 100 yards on the ground in every direction and will notify the creator of the seal when something has entered the area with any sort of chakra higher than your basic animal. The creator will also be given a general direction of where the being with the chakra is coming from, but that's about it. An enemy can avoid detection from this skill by not touching the ground or anything that the ground is touching. Therefore, if an enemy touches a tree, the creator will feel that chakra and know that the enemy is coming, but if the enemy is flying in the air somehow, then the seal will not pick up on that.