The Course Predictor Line - NorthStar 972 Quickstart Manual And Reference Manual

Steering on the chart
You can also steer by watching your
progress directly on the chart screen,
rather than using the steer screens
described above. Several aids in the 972
help you do this:

The course predictor line

The course predictor line (see Using the
course predictor line, on page 38) provides
another effective way to navigate a course
line or even to navigate directly to a point
on the chart. On the chart or radar screen,
just keep the end of the predictor line near
the intended course line, and your vessel
will steer towards and gently merge with
the line.
The predictor line is also shown on the 3D
steer screen where it may appear curved to
represent the actual track on the 3D grid.
Reference Manual Revision B
dotted green line on the chart shows
•
the original track line from your initial
vessel position to the waypoint
dotted red line on the chart shows the
•
direct line from your current vessel
position to the waypoint
a pair of blue dotted lines surrounding
•
the original track line to the waypoint
show the width of the allowable cross
track error. These lines will be present
only if the Cross Track alarm is turned
on)
Note that the blue circle surrounding each
waypoint represents the allowable cross
track error, not the arrival radius.
Reference section 4 — Navigating to Waypoints

The course predictor line

57