I suspect you already know how Watch Alarm works but this is an extract from the Service
Watch Alarm (not available in Standby)
• Engage the Autopilot
in Auto Track Windvane
• To select Watch alarm push Display repeatedly until Watch appears.
The 4 minute timer is now running:-
— After 3 minutes 'Watch' flashes on all control units.
— After 4 minutes the alarm sounds on all control units.
• Push Auto at any time to reset the timer to 4 minutes and silence the alarm.
• To cancel the Watch alarm at any time push Display.
And here is another extract from the Service
6.2 Permanent Watch Alarm Mode.
The ST7000 autopilot
can be set up in a permanent watch alarm mode, as required by the Sea Fish
Industry Authority (S.F.l.A).
It must be stressed that the selection of this mode is permanent and can only be reversed by returning the Course Computer to Nautech.
Permanent Watch Alarm is achieved by first entering the calibration menu. Once in calibration, regardless of display message, press the Auto, Standby, and Track keys together for 1 second before releasing. The display will now show ‘SELECT WATCH’.
The user now has 10 seconds to select permanent watch alarm mode by again pressing Auto, Standby and Track together for 1 second. The display will then show ‘WATCH ON’ for 10 seconds before reverting back to ‘CAL’. A normal exit from calibration mode must now be executed.
If PWAM is set then it appears your course computer will have to go back to Raymarine
as you can't reset it yourself.