NAV mode
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Note: NAV mode requires a compatible chartplotter connected
to the network.
It is not possible to select NAV mode if heading information is
missing, or if steering information is not received from the
external chartplotter.
Warning: NAV mode should only be used in open
waters. Navigation mode must not be used while
sailing, as course changes may result in unexpected
tacks or gybes!
In NAV mode the autopilot uses steering information from an
external chartplotter to direct the vessel to one specific waypoint
location, or through a series of waypoints.
In NAV mode, the autopilot's heading sensor is used as heading
source for course keeping. Speed information is taken from SOG or
from selected speed sensor. The steering information received from
the external chartplotter alters the set course to direct the vessel to
the destination waypoint.
To obtain satisfactory navigation steering, the autopilot system
must have valid input from the chartplotter. Autosteering must be
tested and determined satisfactory prior to entering NAV mode.
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Note: If the chartplotter does not transmit a message with
bearing to next waypoint, the autopilot will steer using Cross
Track Error (XTE) only. In that case you must revert to AUTO
mode at each waypoint and manually change set course to
equal bearing to next waypoint and then select NAV mode
again.
Prior to entering NAV mode the autopilot system should be
operating in AUTO mode. The chartplotter must be navigating a
route or towards a waypoint.
• Initiate NAV mode by pressing and holding the MODE key for 3
seconds when the autopilot is in AUTO mode.
• Confirm to switch to NAV mode in the dialog by pressing the
AUTO key on the autopilot controller or the Enter key on the
IS42.
Autopilot | IS42 Operator Manual
39
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