Chapter 5: Operation 73
CDI Display
The CDI display shows Cross Track Error (XTE) and distance to
waypoint presented in a “runway” format:
Figure 5-5: CDI Display
The runway represents a 0.3nm width with the vessel symbol shown on
the center line when the vessel is on course. Cross Track Error (XTE),
Bearing to Waypoint, Distance to Waypoint, Time to Go (TTG), Course
Over Ground (COG) and Speed Over Ground (SOG) are also shown.
Time to Go is calculated on the basis of distance to destination and Speed
Over Ground (SOG) towards the destination.
At waypoint ranges greater than 4nm, the symbol remains at the top of
the screen. As the waypoint range falls below 4nm, the symbol moves
down the center line.
The checkered pattern moves down the screen to simulate movement
when SOG is greater than 2 knots.
The steering instruction is STEER STARBOARD if the XTE is 0.01nm or
more to port, STEER PORT if the XTE is 0.01nm or more to st a rbo ard or ON
COURSE if the XTE is less than 0.01 on either side. If no GoTo or Follow
is in progress, the steering instruction is NOT TRACKING.
D6241-1
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