Which of the following statements concerning COSPAS-SARSAT is false?
EPIRBs, ELTs, and PLBs use the system primarily for Distress alerting.
These satellites monitor 406 MHz for EPIRB signals.
After initiating a call request and selecting the LES , these satellites may be used for commercial messages .
These satellites use Doppler shift measurement to determine the location of the beacons.
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