Simrad AP26 and AP27 Autopilots
2.20Multiple station system
In normal operation control is accessible from every control unit connected to the autopilot system. One control unit is "active" and provides the user with access to all functions. All remaining control units are "inactive" and have no effect on mode changes or course selection. A single press on any of the mode buttons on an "inactive" control unit will allow transfer of command and make it "active".
2.21Lock function
The "LOCK" function is a safety feature in the autopilot system. It will disable all control units, including the FU25
When the "lock" function is in use, no transfer of command can take place; only the active control unit stays in command.
To enable the "lock" function, make a quick double press on the STBY button.
The display on the active control unit will first show a 
icon and then the icon will alternate with the mode index.
The "locked" control units in the system will show:
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
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