Simrad AP25 - Manual (Page 51)

Operation
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The “Lock function is disengaged by one of the following
actions:
• The active control unit unlocks the other ones and makes them
“inactive” by another double press on the STBY button. It
also displays the icon before it returns to the normal active
state.
• The system is switched OFF by any control unit (press STBY
for 2-3 seconds).