The Pre-Alert

A swimmer's Band will 'Pre-Alert' for a short period of time before sending the entire system into Full Alarm. 

The Pre-Alert causes a distressed swimmer's band to alarm briefly without sending the full system into alarm. The Pre-Alert signals to a swimmer that they have been under the water for too long, or that they are straying from the coverage area of the Hub.

If a swimmer does not, or can not, promptly re-surface or return to the coverage area, then the entire System will enter Full Alarm

  

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