NorthStar Navigation Explorer 660 - Manual (Page 51)

Northstar Explorer 660 Installation and Operation Manual 51
15-3 Setup > Sonar
Press MENU once or more until the Setup menu
is displayed, then select Sonar:
Frequency
There is a choice of: 200 kHz, 50 kHz and
50+200. For information about selecting a
suitable frequency for the water conditions, see
section 8-3.
Scroll speed
Use this to set the scroll speed on the display. There
is a choice of: Very Fast, Fast, Medium,
Slow and Pause. The depth of the water also
affects the speed of the display.
Faster scroll speeds combined with a slow boat
speed (typically between 2 and 6 knots) shows the
most fish detail. Medium or Slow scroll speeds
result in sonar information being displayed over
a longer period, but with less detail (see Section
8-2).
Fish symbols
The Explorer 660 always displays echoes from
fish (fish arches, see section 8-4). If fish symbols
are on, a symbol is displayed over the arch (see
section 8-4). The options are:
• Off: No fish symbol is displayed..
• Fun or Normal: A fish symbol is displayed.
• Fun depth or Normal
depth: A fish symbol is displayed and the depth
shown beside the fish symbol.
Fish filter
Use this to select the minimum fish size to be
displayed and to trigger the Fish alarm. The
options are: Small, Medium and Large.
Digit size
Use this to remove or change the size of the
depth display on the sonar displays. There is a
choice of: Small, Medium and Large.
Depth line
This is a horizontal line that can be moved up or
down using the
or cursor keys. The depth
line can be used to find the depth of a fish or
other object shown. When in the Sonar Zoom
display, the depth line marks the centre of the
zoomed area.
It can be switched On or Off. If switched On, it
appears on all the sonar displays.
Bathymetric Lines and soundings
Chart cards contain a large amount of spot
sounding and depth contour data. This can be
selectively displayed by turning Bathymetric Lines
and Spot Soundings on, then selecting the range
to display with Bath and Sndgs Min and Max.
Attention Areas
Areas of importance, such as restricted anchorages
and shallow areas, are highlighted as Attention
Areas.
The options are:
On: displays attention area boundaries and
information icons
.
Off: does not display attention area
boundaries or information icons
.
Note: In some early chart cards the information
icons
are inactive.
Depth area limits
The depth area limits control the chart water
colors for different depths. There are three water
colors:
Surface to Depth area limit 1:
Shallow water color.
Depth area limit 1 to Depth
area limit 2:
Medium water color.
Below Depth area limit 2:
Deep water color.
The actual water colors depend on the palette in
use (see above).