{HEAD ~ A ranging calculator} can be operatively coupled to the receiver and calculate {TAIL ~ a distance} between the locator transceiver and the source of the distress messages based on the time delay between transmitted ranging commands and corresponding received ranging messages 
operatively coupled to calculate
{ HEAD ~ A ranging calculator } can be operatively coupled to the receiver and calculate { TAIL ~ a distance } between the locator transceiver and the source of the distress messages based on the time delay between transmitted ranging commands and corresponding received ranging messages
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