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The above figure shows this message as displayed on an Jotron TR-8000
MkII AIS.
7.11
121.5 MHz homing signal
The EPIRB transmits a sweep tone homing signal on 121.5 MHz that can be
detected by overflying airplanes and the SAR vessels.
7.12
Position receiver (GNSS)
Jotron EPIRBs have a built in GNSS receiver capable of receiving position
signals from GPS, GLONASS and Galileo satellite systems. The position is
encoded by the message generator of the EPIRB and transmitted to the
Cospas-Sarsat satellites. The GNSS position and the position calculated by
the Cospas-Sarsat system itself will together give a precise indication of the
actual position.
In addition, the position data from the GNSS receiver will be used in the AIS
homing signal visible for all nearby AIS receivers.
The position fix is updated each 5 minutes for both Cospas-Sarsat messages
and AIS messages and reflected in the next transmission.
