ComNav P4 Installation and Operation Advanced Operations
Document PN 29010100 V1r0 - 163 -
The main Control Head always shows the outline key icon, because you can always take
command back with the main Control head. This unconditional return of command is an
important safety feature.
Caution! If your P4 system is equipped with Jog Levers, you must be aware that they
can be activated any time the autopilot is turned on. They can not be turned off or locked
out. It is your responsibility to see that appropriate measures are taken to ensure that
they cannot be activated by accident.
Watch Alarm
The Watch Alarm is a special timer built into the P4 autopilot. It measures how long it has
been since any of the buttons on the Control Head have been pressed. If the time exceeds
the amount set for the Watch Alarm parameter in the Standby menu, an alarm is activated to
alert the operator.
There are two ways that the Watch Alarm feature can be configured:
1) The Watch Alarm can be set to bring up an alarm message and sound the audible
alarm on the Control Head. At the same time, the audible alarm on the SPU will
sound. Once the alarm is set off it can only be reset by pressing the ENTER button.
2) The Watch Alarm can be set up to operate exactly in the same manner as above, but
in addition, if the alarm is not reset within 30 seconds (by pressing the ENTER
button), an external alarm connected to the SPU will be activated. The external alarm
can be used to alert ship’s personnel that the helm may be unattended.
To use the Watch Alarm as per option 1, the Alarm O/P parameter in the Dockside Setup
menu must be set to “none”, Sw’d B+ and “all”, or Sw’d B- and “all”.
To use the Watch Alarm as per option 2, the Alarm O/P parameter in the Dockside Setup
menu must be set to Sw’d B+ and “watch”, or Sw’d B- and “watch”. You must also have a
compatible external alarm connected. See
External Alarm Output for more details.
The Watch Alarm timer is controlled by the Watch Alarm parameter in the Standby menu.
The value may be adjusted from “OFF” (Watch Alarm completely inactive) to 30 minutes in
1-minute increments.
The Watch Alarm parameter is password protected. The autopilot will not allow you to change
the Watch Alarm timer without first correctly entering a password.
There are a few key points to remember about passwords:
1) For safety reasons, only authorized persons should be allowed to know or change
the Watch Alarm password.
2) The password consists of a button sequence entered on the Control Head, consisting
of 0 to 10 button presses. For the best security, we recommend choosing a password
with a minimum of a 5-button sequence.
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