Kongsberg Simrad ST90, Reference Manual

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Variable Range Ring
An adjustable range ring can be added to the Horizontal and Vertical views. The ring
is shown as a dotted circle with its centre on the vessel symbol. The current range
is shown next to the circle. To change the range, left-click on the circle and drag to
requested diameter. You can use
VRR Range
to manually define a range. The variable
range ring can be used for any type of distance measurement relative to the sonar.
VRR Range
(Variable Range Ring Range) You can use
VRR Range
to manually define a range for
the variable range ring.
Map
This is an "on/off" switch. Use
Map
to enable or disable the geographical map layer.
The map is only shown in Horizontal views when
Range Projection
is set to True . This
function is opened from the
Active
menu.
Compass Cards
Activate
Compass Cards
to place evenly spaced compass markers on the outer range
ring in horizontal views. The compass markers rotate based in the inputs from a
navigation sensor. An update takes place when the vessel heading changes more
than 1 degree.
Depth Dividers
Depth dividers are horizontal dotted lines used to indicate depth. You can only add
these lines to vertical views. Use this function to toggle the depth divider lines
On
or Off .
Coverage Plot
When you operate with sector transmissions, the area covered by the sonar beams is
limited by the chosen transmit sector angle. To make it easier to recognize the area
limits, dedicated border lines may be added to the presentation. These lines are used to
outline the sector. Use this function to toggle the coverage plot lines
On or Off .
The function is also useful in omni views. If you increase the tilt, and then exceed the
range using the
View Range
function,
Coverage Plot
will indicate the current practical
range with a circle. The same applies if you set
Range Projection
to True .
Purse Depth
A line of X’es in the vertical views shows the bottom of the purse seine. The depth
is defined for the fishing gear you have chosen. Use
Purse Depth
on the
Cosmetics
menu to toggle this line On or Off .
Simrad ST90 Reference Manual