When you are on a fire scene and communications become difficult due to the sound of everything around and/or heavy radio traffic, what is one way you communicate?   What about some hand signs?  If you had a chance to communicate without yelling or having to walk away from your assignment how would that help?  I am working on a lesson plan for just that.  Communications is a vital part of the job.  What type of equipment, or words would help?

Thanks!!