ComNav P4 Installation and Operation
Basic Operations
Document PN 29010100 V1r0 - 140 -
Figure 61 – HI and LO Speed Icons (Left of Rudder Angle Indicator)
Speed Trip Pt – Speed Trip Point
The Speed Trip Point governs the point at which the autopilot automatically transitions from
the Lo steering parameters to Hi. For an automatic transition to take place, the Parameter Set
must be set to “Auto.”
Speed Source
The P4 can obtain information about the vessel’s speed from a variety of sources that provide
NMEA 0183 data outputs, at either the NAV1 or NAV2 inputs on connector J9. This menu
item is used to select which of the two inputs the autopilot will use.
The selected input can be the same one used for the Compass source, and/or the Navigation
data source.
ALC - Automatic Leeway Correction
The P4’s Automatic Leeway Correction (ALC) feature is turned on or off with this parameter.
It is active only in AUTO mode. See the Following a Track section for more information.
Thruster Assist / Thruster Gain
These two functions are only available when the parameter is not set to “None.” Complete
instructions are included with the CT7 Thruster Interface.
NAV Mode
In NAV mode, the P4 Advanced Autopilot system can use steering information from an
external NMEA 0183 Navigation System, to steer to a destination, or along a route of
waypoints leading to a final destination.
In NAV mode, the P4 uses its own compass (or the Navigation System) as its primary source
of heading for course keeping, while the steering data received from the Navigation System is
used to calculate the commanded heading to the destination or next waypoint.
To activate NAV mode:
Turn on your Navigation System and activate a waypoint.
Press the NAV button on the Control Head until the letter “N” appears in the upper
left portion of the display, indicating NAV mode has been initiated (Figure 62).
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