SOS button
Pressing and holding the SOS button down for a minimum of 5 seconds activates the SOS function. When activated, the Identifier transmits an AIS Safety Related Message with the text contents 'MAYDAY MAYDAY'. The message repeats every minute while the function is active.
While active the status indicator flashes red every 5 seconds. Press and hold the SOS button for another 5 seconds to disable the SOS function.
Figure 24 : SOS function activation