Divers use hand signals to communicate with each other underwater and on the surface. Most of these signals are universally understood around the world. Other signals vary by location, instructor, or certification agency.

A pre-dive review of hand signals is an important preparation before every dive. This prevents any confusion over what a specific signal means, and also provides an opportunity to share special signals you've learned from others or developed by yourself.

You'll begin using hand signals during the first pool session. The following pages illustrate the common signals used both at the surface and underwater.