ComNav P4 Installation and Operation Appendices
Document PN 29010100 V1r0 - 175 -
Appendix 2
Error Messages
There are a number of different error messages that display for varying reasons and at
different times in the P4 autopilot system. These messages are displayed on the Control
Head screen, and are usually accompanied by an audible alarm.
The following errors are classified as warnings. Operation of the autopilot continues normally.
The error messages may be temporarily suppressed by pressing the ENTER button. They
are automatically cancelled should the condition that caused them be removed.
The vessel is in AUTO, WORK or NAV modes, and has
been off the commanded course by more than 20° for more
than 32 seconds.
The vessel is in mode, and the angle of the has been more
than 20° different than the commanded angle, for more
than 32 seconds.
Adjust steering parameters to prevent this.
The system has detected a non-fatal error in one of the
memory devices on the SPU.
Contact your ComNav Dealer for repair service at your
earliest convenience.
The system previously detected an auxiliary Control Head
connected to J12-
AUX 1 ( but cannot detect it now.
Check all wiring.
The measured rate of turn of the vessel has exceeded the
Turn Rate set in the Auto menu.
The measured rate of turn of the vessel is much lower than
the Turn Rate set in the Auto menu.
The Navigation System used in NAV mode has sent a
message to the P4 indicating that the vessel has entered
the arrival circle around the active waypoint.
The P4 has detected that the has shifted by more than the “
Shift” value in the menu, for a period of time exceeding the
“ Shift Delay” set in the menu.
The Speed is less than about 6 Knots.
The Cross-Track Error limit set in the Nav menu has been
exceeded. Adjust steering parameters to prevent this. Also,
ensure “XTE Sense” in the Nav menu is set correctly.
Table 10 – Warning Messages
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