http://goo.gl/KVHbF0
Human echolocation is simple science that can be easily understood and put into practice in a very short time. Soon, you will have an entirely new perspective on your surroundings and a whole new confidence level in your life. There is no need to rush into it or practice in public if you are not comfortable. Learn the concepts on your own time, in the comfort of your own home. Echolocation can be a great supplement to other forms of O&M, using it once in a while as necessary, or it canbe one of your primary modes of orientation allowing you to see in great detail and even go “sight-seeing”.