Northstar Explorer 557/567 Installation and Operation Manual
50
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 display.
This option is useful for navigating narrow
harbours or rivers. The 557/567 asks for a
course deviation; 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.
15-2 Setup > Chart
Press twice, then select Chart:
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.
Palette
Select the color scheme for the LCD display. The
options are:
Normal: For viewing in normal conditions.
Sunlight: Brighter colors, more visible in
sunlight.
Night: Reversed colors for night, to
preserve night vision.
Map datum
557/567 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 557/567 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 557/567 map
datum to match the datum of the paper chart.
Then, the latitude and longitude coordinates of
objects displayed on the 557/567 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
557/567 asks if you want to apply the NMEA
datum offset (see below).
!
WARNING
When you change to a chart with a different
datum, change the 557/567 map datum
again.
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