Simrad SP90
OPERATIONAL MODES
The SP90 sonar provides you with several different display
modes. These have been created to cover all your operational
needs. Only the most common modes are described here.
Bow up
When
Bow up
is selected, the vessel symbol is stationary on the
screen with the bow pointing upwards. The echo presentation
covers 360 degrees around the vessel, and all echoes are updated
for every ping. The distance from the vessel symbol to the outer
echo ring is equal to the selected range.
270°/Vertical
The
270°/Vertical
mode is specially designed for purse seining.
The vertical half slice is displayed in the lower left corner
with the net on the starboard side. If the net is set on the port
side, the 60 degrees vertical slice will be displayed in the
lower right hand corner. With this presentation, you will find it
easy to keep in contact with a school in both the vertical and
horizontal presentation, and to determine its size distribution.
The position of the school relative to the bottom is another
important information provided by this presentation. The
Catch
data
presentation for purse seining is shown on the right hand
side (remove the menu!). It shows all the net data relative to the
target and the bottom, as well as relevant target data.
Bow Up/Vertical
The
Bow up/Vertical
mode is specially designed for purse seining.
The picture is divided into three sections; where the left side is
a bow-up presentation. The upper part on the right hand side is
a
Catch data
presentation (remove the menu!), while the lower
part provides a vertical slice presentation.
North up
When
North Up
is selected, true north is always up on the screen.
The vessel symbol is stationary with the bow pointing in the
vessel’s course direction. The movement of the echoes across the
screen are controlled by a combination of the vessel’s course and
speed and the target’s own movements.
True motion
When
True Motion
is selected, the picture is locked to a
geographical position, where the vessel moves around the screen
according to its present course and speed. All echoes are always
presented in their correct position relative to the vessel, and their
movements on the screen will be a true representation of the
movements of the targets through the water. When the vessel
12
850-165261/A
Summary of Contents for Simrad SP90 Series
Page 2: ......
Page 43: ...Index 850 165261 A 41 ...
