A few reasons Scouts need to know how to tie a square knot:

  1. It can be used in first aid to tie bandages.
  2. Tie your laces so that they can’t get pulled off if you are stuck in mud.

Below you will find a great video showing you step-by-step how to tie a Square Knot.

You can follow  step-by-step pictures from eHow.

square knot picture step-by-step