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1. OPERATIONAL OVERVIEW
1-18
1.9 Display Range
You can change the chart scale to change the amount of in-
formation shown, or zoom in or out at the location you select,
in the plotter and steering displays. The selected chart scale
appears at the bottom right-hand position on the screen. The
available ranges depends on latitude and chart area.
To select a display range, rotate the RotoKey
TM
. Clockwise
to increase the range; counterclockwise to decrease the
range.
1.10 Orientation Mode
The chart can be shown in head-up, north-up, course-
up and auto course-up. Select an orientation mode
from the RotoKey menu: Select [Mode] followed by
[Head Up], [North Up], [Course Up] or [Auto Course
Up]. The selected mode appears at the top right-hand
position.
Description of orientation modes
Head-up: Displays the chart with the current compass heading of your boat at the top
of the screen. The heading data from a compass is required. When the heading
changes, the ship icon remains fixed, and the chart picture rotates according to head-
ing.
North-up: North is at the top of the screen. When your heading changes, the ship icon
moves according to heading. This mode is for long-range navigation.
Course-up: The chart picture is stabilized, and shown with your current course (over
ground) at the top of the screen. The ship icon moves with the heading. If you select
a new course, the picture resets to display the new course at the top of the screen. If
no destination is set, the course is upward on the screen at the moment course-up is
selected.
Range scale
20 NM
Orientation mode
GPS 3D
PT00001
5 NM