Fish Id 3D Reference (3D Sonar Views Only); Real Time Sonar (Rts™) Window; (2D Sonar View Only); Zoom Width (2D Zoom View Only) - Humminbird 748 3D Operation Manual

Fish ID 3D Reference selects the reference line style used in the 3D Sonar
View. Selecting Surface draws a line from the fish icon to the surface plane.
Bottom draws a line from the fish icon to the bottom contour; and selecting
Both draws both lines.
RTS Window™ sets the RTS Window™ to either Wide or Narrow, or turns it off
in the 2D Sonar View. The RTS Window™ always updates at the fastest rate
possible and only displays returns that are within the transducer beam. See
What's on the 2D Sonar Display for more information.
NOTE: The Wide RTS Window™ does not use grayscale.
RTS Window™ (Wide)
Zoom Width adjusts the width of the zoomed view on the 2D Zoom View,
which is on the left side of the display. See Views: Sonar Zoom View for more
information.
Sonar Menu Tab
Fish ID 3D Reference
(3D Sonar Views only)
Settings: Surface, Both, Bottom, Default = Bottom
Real Time Sonar (RTS™) Window

(2D Sonar View only)

Settings: Wide, Narrow, Off, Default = Wide
RTS Window™ (Narrow)
Zoom Width
(2D Zoom View only)
Settings: Narrow, Medium, Wide, Default = Wide
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RTS Window™ (Off)