Garmin GPSMAP 87 Series Owner's Manual page 35

The RealVü 3D sonar views provide three-dimensional views of
either what is in front of or below your boat. The screen updates
with each sweep of the transducer.
To see all five Panoptix sonar views, you need one transducer
to show the down views and a second transducer to show the
forward views.
To access the Panoptix sonar views, select Sonar, and select a
view.
LiveVü Down Sonar View
This sonar view shows a two-dimensional view of what is below
the boat and can be used to see a bait ball and fish.
Panoptix down view history in a scrolling sonar view
Boat
Range
Trails
Drop shot rig
Bottom
LiveVü Forward Sonar View
This sonar view shows a two-dimensional view of what is in front
of the boat and can be used to see a bait ball and fish.
Boat
Range
Fish
Trails
Bottom
RealVü 3D Forward Sonar View
This sonar view shows a three-dimensional view of what is in
front of the transducer. This view can be used when you are
stationary and you need to see the bottom and the fish
approaching the boat.
Sonar Fishfinder
Color legend
Boat
Ping indicator
Fish
Bottom
Range
RealVü 3D Down Sonar View
This sonar view shows a three-dimensional view of what is
below the transducer and can be used when you are stationary
and want to see what is around your boat.
Color legend
Boat
Sonar beam
Range
Fish
Bottom
RealVü 3D Historical Sonar View
This sonar view provides a three-dimensional view of what is
behind your boat as you are moving and shows the entire water
column in 3D, from the bottom to the top of the water. This view
is used for finding fish.
Color legend
Boat
Range
Bottom
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