Furuno IC-307 Operator's Manual page 7

SSAS operation flow
1.
Open the cover and press button one second.
SSAS report is immediately transmitted.
2.
An LES sends acknowledgement to your ship.
3.
SSAS report is automatically sent to multiple addresses if applicable.
4.
Repeated transmission of the SSAS report begins. The interval at
which to transmit the SSAS report to each address can be specifed.
The SSAS report is continuously transmitted at the interval selected.
5.
To cancel repeated transmission:
Terminal unit: Turn off the communication unit. Press and hold down
the button on the SSAS unit while turning on the communication unit.
Release the button when the test mode starts. (The FELCOM 16 goes
into the button test mode.)
Note that if there are any unsent messages they are sent and then the
system goes into normal operation; namely, the test mode is not
activated.
PC: Open the SSAS manager (see page 10) and input the command
TERMINATE SSAS ALERT.
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