Furuno FM-8700 Operator's Manual page 22

Distress alert transmission and output power
When the distress alert is transmitted (by pressing the [DISTRESS]
key), the output power of the FM-8700 is automatically set to maxi-
mum (25 W).
When keyboard input is prohibited
The DSC section keyboard accepts no key input while a DSC mes-
sage is being transmitted. (DSC keyboard is inoperative about 3
seconds during a DSC distress call; 0.5 seconds for other DSC
calls.)
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