ComNav P4 Installation and Operation
Basic Operations
Document PN 29010100 V1r0 - 142 -
Nav Menu
The Nav menu contains a number of parameters used when operating the autopilot in NAV
mode. To access the Nav menu, double-press the NAV button.
Figure 63 – Nav Menu, pages 1 and 2
Nav Source
Set the Nav Source to the SPU’s input connection (NAV1 or NAV2) that the external
Navigation System is connected to. The autopilot will then look at that input when in NAV
mode to obtain the bearing and course-to-steer information.
The selected input can be the same one used for the Compass source, and/or the Speed
source.
XTE Limit - Cross-Track Error Limit
The autopilot will raise an alarm while in NAV mode if the vessel’s cross-track error exceeds
the limit set here.
WayPt. Arrival - Waypoint Arrival
When the vessel arrives at a waypoint or the end of a route, a special “arrival” message is
sent to the autopilot from the Navigation System. This menu item tells the P4 how you want
to deal with the arrival message.
Manual (manual sequencing):
• Displays “Waypoint Arrival” on the Control Head screen, accompanied by an audible
alarm. The autopilot will maintain its present course and NOT automatically turn the
vessel to the next waypoint in a route until the alarm has been acknowledged by
pressing the ENTER button.
Auto (automatic sequencing):
• Displays “Waypoint Arrival” on the Control Head screen, accompanied by an audible
alarm. However, the autopilot will automatically turn the vessel to the next waypoint in
a route even if the alarm is not acknowledged by pressing the ENTER button.
Silent (silent sequencing):
• Automatically turns the vessel to the next waypoint in a route. Caution! No waypoint
arrival alarm will be displayed. Choose this option if your Navigation System has its
own waypoint arrival alarm that cannot be turned off, and you do not wish to
acknowledge the same alarm on multiple devices.
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