COMMON HAND SIGNALS - NEADC
EFFECTIVE1 DECEMBER 2005COMMON HAND SIGNALSFORRECREATIONAL SCUBA DIVINGAs Approved By
2005, Recreational Scuba Training Council, Inc. (RSTC)Recreational Scuba Training Council, IncP.O. Box 11083Jacksonville, FL 32239 USA1
EFFECTIVE 1 DECEMBER 2005Recreational Scuba Training Council(RSTC)Common Hand SignalsforRecreational Scuba DivingScope and PurposeTo formally standardize the most common hand signals used during recreational scuba diving.Effective underwater communication is necessary for the safe and efficient conduct of anyrecreational or training-related scuba dive. The most convenient and reliable method ofcommunication between divers is through the use of simple hand signals.Where possible, hand signals should be derived from those with similar meanings on land, toreduce learning effort and time. This also makes these signals easier to understand by diverswho have been trained by different organizations, speak different languages, or come fromdifferent countries.Effective underwater communication is necessary for the safe and efficient conduct of anyrecreational or training-related scuba dive. While many mechanical or electronic underwatercommunications devices are available, in the majority of situations, the most reliable method ofcommunication between divers is through the use of simple hand signals.Divers exchange hand signals to give each other instructions, provide information on the dive,and indicate their condition. The signals employed by divers to increase the efficiency of theirdives are natural signals, local signals and those created for special circumstances.Natural signals are those whose meaning is obvious in any language, such as shrugging theshoulders for “I don’t know,” nodding the head for “Yes,” shaking the head for “no” or pointingto a gauge to mean “What does it read?”Local signals are those applicable to a specific area, such as a cupped hand for “abalone” andthumb and first two fingers opening and closing for “moray eel.”Special signals are those created for circumstances such as instruction, for example, two indexfingers alongside each other for “get with your buddy,” or hand flat with palm down for “leveloff .” The signals found in this document fall under this category.2
The signals are hand motions instead of finger motions, making them easy to perform by diversboth wearing and not wearing mittens. Where possible, the signals were derived from those withsimilar meanings on land, to reduce learning effort and time. Signal systems using methodsother than hand signals, were not included in this standard because of their limited use by sportdivers.Regardless of the experience and knowledge of the divers involved, it is always prudent toreview hand signals and their meanings prior to each dive so that no confusion occurs during thedive.Many commonly used signals pose a question such as “Are you OK?” and these require the otherdiver to return the same signal to indicate an affirmative response or an alternate signal if aproblem exists. When using hand signals, divers should employ deliberate, clear movements,pausing if necessary between signals to ensure comprehension by their dive buddy.3
Common Diving Hand SignalsStopRaise hand vertically, fingers together,palm facing the receiver.May be followed by another signalindicating reason for stopping.Go down or I’m going down.Make a fist with one hand, thumbextended downward.Downward movement of the handindicates direction of travel.Go up or I’m going up.Make a fist with one hand, thumbextended upward.Upward movement of the hand indicatesdirection of travel.4
Common Diving Hand SignalsAre you OK? or OK!With thumb and forefinger make a circle,extending three remaining fingers ifpossible.Are you OK? or OK! (wearing gloves or mittens).With thumb and forefinger make a circle,extending the three remaining fingers ifpossible.Divers wearing mittens or thick gloves maynot be able to extend the three remainingfin
Common Hand Signals for Recreational Scuba Diving Scope and Purpose To formally standardize the most common hand signals used during recreational scuba diving. Effective underwater communication is necessary for the safe and efficient conduct of any recreational or training-related scuba dive. The most convenient and reliable method of
Signals And Systems by Alan V. Oppenheim and Alan S. Willsky with S. Hamid Nawab. John L. Weatherwax January 19, 2006 wax@alum.mit.edu 1. Chapter 1: Signals and Systems Problem Solutions Problem 1.3 (computing P and E for some sample signals)File Size: 203KBPage Count: 39Explore further(PDF) Oppenheim Signals and Systems 2nd Edition Solutions .www.academia.eduOppenheim signals and systems solution manualuploads.strikinglycdn.comAlan V. Oppenheim, Alan S. Willsky, with S. Hamid Signals .www.academia.eduSolved Problems signals and systemshome.npru.ac.thRecommended to you based on what's popular Feedback
Diagram 11: Official Hand Signals (Indoor) 1. All signals which are made with one hand shall be made with the hand on the side of the team that commits the fault or makes the request. 2. After the signal is made, the referee gestures to the player who has committed the fault or the team that has made the request. Move the hand to indicate the
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