Garmin GPSMAP 87 Series, Owner'S Manual, Page: 42 / 86

Depth Range : Adjusts the range of the depth scale.
Allowing the device to adjust the range automatically keeps
the bottom within the lower portion of the sonar screen, and
can be useful for tracking a bottom that has minimal or
moderate terrain changes.
Manually adjusting the range enables you to view a specified
range, which can be useful for tracking a bottom that has
large terrain changes, such as a drop-offs or cliffs. The
bottom can appear on the screen as long as it appears within
the range you have set.
Available in LiveScope sonar view.
Forward Range : Adjusts the range of the forward scale.
Allowing the device to adjust the range automatically adjusts
the forward scale in relation to the depth. Manually adjusting
the range enables you to view a specified range. The bottom
can appear on the screen as long as it appears within the
range you have set.
Available in LiveScope sonar view.
Range : Adjust the range.
Allowing the device to adjust the range automatically keeps
the bottom within the lower or outer third of the sonar screen,
and can be useful for tracking a bottom that has minimal or
moderate terrain changes.
Manually adjusting the range enables you to view a specified
range, which can be useful for tracking a bottom that has
large terrain changes, such as a drop-offs or cliffs. The
bottom can appear on the screen as long as it appears within
the range you have set.
Available in Perspective sonar view.
Transmit : Stops the active transducer from transmitting.
Sonar Setup : Adjusts the setup of the transducer and the
appearance of the sonar returns ( LiveScope and Perspective
Sonar Setup , page 34 ).
Edit Overlays : Adjusts the data shown on the screen
( Customizing the Data Overlays , page 5 ).
LiveScope and Perspective Sonar Setup
From the LiveScope or Perspective sonar view, select Menu >
Sonar Setup .
Appearance : Configures the appearance of the sonar screen
( LiveScope and Perspective Appearance Settings ,
page 34 ).
Layout : Configures the layout of the sonar screen ( LiveScope
and Perspective Layout Settings , page 34 ).
Noise Reject : Reduces noise and interference and attempts to
remove returns that are not actually targets in the water.
Ghost Reject : Reduces the occurrence of "ghost" images,
which are duplicated or reflected images that are not actually
targets in the water. "Ghost" images are caused by strong
sonar returns, such as the bottom. Shallow water and hard
bottoms generally have stronger returns and may cause
"ghost" images to occur more obviously.
Adjusting the Ghost Reject and Noise Reject settings
together reduces the occurrence of "ghost" images most
effectively.
TVG : Adjusts the time varying gain, which can reduce noise.
This control is best used for situations when you want to
control and suppress clutter or noise near the water surface.
It also allows for the display of targets near the surface that
are otherwise hidden or masked by surface noise.
Overlay Data : Sets the data shown on the sonar screen.
Installation : Configures the transducer ( Traditional, Garmin
ClearVü, and SideVü Transducer Installation Settings ,
page 31 ).
LiveScope and Perspective Appearance Settings
From the LiveScope or Perspective sonar view, select Menu >
Sonar Setup > Appearance .
Color Scheme : Sets the color palette.
Color Gain : Adjusts the contrast of colors shown on the screen.
You can select a higher color gain value to see minor
variances in targets with large color changes. You can select
a lower color gain value to see more similar colors in the
same situation.
Trails : Sets the how long the trails appear on the screen. The
trails show the movement of the target.
Bottom Fill : Colors the bottom brown to distinguish it from the
water returns. Not available in Perspective mode.
LiveScope and Perspective Layout Settings
From the LiveScope or Perspective sonar view, select Menu >
Sonar Setup > Layout .
Grid Overlay : Shows a grid of range lines. The Grid option
shows a square grid. The Radial option shows a circular grid
with radial angle lines.
Scroll History : Shows the sonar history on the side of the
screen. Not available in Perspective mode.
Beam Icon : Selects the icon used to show the direction of the
transducer beam.
On-screen Control : Shows the on-screen buttons.
Reverse Range : Adjusts the amount of range shown behind the
transducer.
Compress Range : In forward views, compresses the forward
range farther away from the boat and expands the range
closer to the boat. This allows you to see closer objects more
clearly while keeping farther objects on the screen.
Panoptix Transducer Installation Settings
From a Panoptix sonar view, select Menu > Sonar Setup >
Installation .
Install Depth : Sets the depth below the water line where the
Panoptix transducer is mounted. Entering the actual depth at
which the transducer is mounted results in a more accurate
visual presentation of what is in the water.
Bow Offset : Sets the distance between the bow and the forward
view Panoptix transducer installation location. This allows
you to view the forward distance from the bow instead of the
transducer location.
This applies to Panoptix transducers in the FrontVü, LiveVü
Forward, and RealVü 3D Forward sonar views.
Beam Width : Sets the width of the down view Panoptix
transducer beam. Narrow beam widths allow you to see
deeper and farther. Wider beam widths allow you to see
more coverage area.
This applies to Panoptix transducers in the FrontVü, LiveVü
Down, and LiveVü Forward sonar views.
Use AHRS : Enables the internal attitude heading and reference
system (AHRS) sensors to detect the installation angle of the
Panoptix transducer automatically. When this setting is
turned off, you can enter the specific installation angle for the
transducer using the Pitch Angle setting. Many forward view
transducers are installed at a 45-degree angle and down
view transducers are installed at a zero-degree angle.
Flipped : Sets the orientation of the Panoptix sonar view when
the down view transducer is installed with the cables pointing
toward the port side of the boat.
This applies to Panoptix transducers in the LiveVü Down,
RealVü 3D Down, and RealVü 3D Historical sonar views.
Calibrate Compass : Calibrates the internal compass in the
Panoptix transducer ( Calibrating the Compass , page 35 ).
34 Sonar Fishfinder