ComNav 2001 Autopilot System
P/N 29010017 V1.0 - 28-
VTG - Vessel Track and Ground Speed
NAVIGATION INTERFACE
CROSS TRACK ERROR RESPONSE
The response of the autopilot is set with the
master select switch in the NAV position.
Press the TURN key, and then the green
ARROW key to select normal (indicated by an
'n' on the right of the display), or reversed
(indicated by an 'r' on the right of the display)
response to cross track error.
If the setting is incorrect, the vessel will initially
turn to the correct heading, but then as some cross
track error develops, the vessel will continually
turn further and further away from the correct
heading to the waypoint.
Cross Track Error contains two pieces of
information; the amount of the error, and the
'sense' of the error (ie. whether the vessel is to the
Left or the Right of the line between the
beginning and ending waypoints). The NMEA
(National Marine Electronics Association) has
specified how the cross track error should be
identified (ie. a (L)eft indicator in the data
sentence means the vessel should steer to the left,
and a (R)ight indicator meaning the opposite).
Some manufacturers, however, have reversed
their cross track error identification. Because of
this confusion, the response of the autopilot to
cross track error can be switched from 'Normal',
meaning the vessel will respond normally to the
sense of the cross track error, to 'Reversed',
meaning the vessel will respond the opposite way
in response to the same information.
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