Operation Manual

8120 Installation and Operation Manual58
Press
MENU
once or more until the Setup
menu is displayed, then select Chart:
Rotation
The options for chart rotation are:
North up: North is always at the top of
the chart window.
Track up: The chart is rotated so
that the boat direction is to the top of
the window. This option is useful for
navigating narrow harbours or rivers. The
Instrument asks for a course deviation
resolution; this is how much the boat
direction needs to change to make the
chart redraw.
Tip: If the chart redraws too
frequently, increase the course
deviation setting.
Course up: This option is only available
if the boat is navigating to a destination.
The chart is rotated so that the plotted
course to the destination is vertical.
17-2 Setup > Chart
Palette
Select the colour scheme for the LCD window.
The options are:
Normal
Sunlight: Brighter colours, more visible
in sunlight.
Night: Reversed colours for night, to
preserve night vision.
Map datum
Instrument GPS positions are based on a
worldwide reference (datum) known as WGS
84. Most paper charts are based on WGS
84. However, some paper charts are based
on other datums In these cases, the latitude
and longitude coordinates of objects on the
Instrument chart window are different to
the latitude and longitude coordinates of
these objects on the paper chart. This applies
to all objects, such as the boat, waypoints,
tracks, lines of latitude and longitude and
cartographic features such as land, rocks,
buoys and depth contours.
Use Map datum to select the Instrument
map datum to match the datum of the paper
chart. Then, the latitude and longitude
coordinates of objects displayed on the
Instrument will change to match the
corresponding coordinates on the paper
chart.
Setting map datum
1 In the Chart setup menu, select Map
datum.
2 Select the map datum for the paper chart
you are using.
3 If you select a datum other than WGS 84
the Instrument asks if you want to apply
the NMEA datum offset (see below).
When you change to a chart with a
different datum, change the Instrument
map datum again.
CAUTION
!
!
CAUTION
DANGER
WARNING