Signals must be displayed clearly and distinctly to be effective. Follow these guidelines to make sure your buddy understands the message you're communicating.

Display signals in a position that's easy for your buddy to see. For example, if you're wearing black gloves and a black wetsuit, display signals away from your chest so that your hand can be seen against the background.

Respond to all signals by repeating the signal back to your buddy to indicate you received and understand the signal. For example, if your buddy displays the signal to ascend, respond with the ascend signal before you both begin to ascend.

"OK" signals are used as both a question and answer. For example, your instructor will display the signal after you've demonstrated a skill to ask you if you're OK. Respond with the OK signal if you are in fact OK.