Rotating The Chart - NorthStar 957 Operator's Manual

Chapter 4 - Using the Chart Screen

Rotating the chart

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display or change the setup functions for the CHART
•
screen (CHART SETUP key); for details, see "Setting up
the chart screen" starting on page 45
specify points to go to on the CHART screen (GO TO CUR-
•
SOR key)
The chart rotation feature lets you change the angle of the
charts that are displayed on the CHART screen. You can turn
charts to any one of the following angles:
•
North up - You'll see north pointing straight upwards (the
chart isn't turned).
•
Course-up - You'll see your vessel's current direction of
travel—whatever that direction is—pointing straight
upwards. Course-up represents your true COG as deter-
mined by the GPS receiver. The 957 ignores any course
changes if your speed is under half a knot. The chart will
rotate sooner for large turns than for small ones.
Note: Your COG is often different from your heading, so
what you see straight ahead in the real world may be
different from what's displayed on the screen.
•
Leg-up - You'll see your vessel's current leg to a way-
point—whatever direction that is—pointing straight
upwards. The 957 will adjust the chart on a leg-by-leg
basis, so the chart turns accordingly whenever you start
navigating on a new leg, even if you haven't turned the
vessel yet. Exception: If you select leg-up when you aren't
currently navigating, the 957 automatically uses
course-up—until you start navigating along another leg.
If you're viewing course-up or leg-up, the text from the
Navionics cartridge is tilted to match the rotation angle in
order to avoid text overlap.
You can change the chart rotation right on the CHART screen
by pressing the ROTATE key.
The following three screens show how the chart looks if you're
travelling along a sample route that has four waypoints, and
957 Operator's Manual, Rev. B