Garmin GPS Receiver GPSMAP User Manual

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Sounder Page
The sounder page is where your GPSMAP 135 Sounder becomes a powerful
fishfinder. The top of the screen contains any of seven selectable data field options,
while the middle of the page contains a right-to-left moving sonar image of the
water beneath your boat. (Note: Items appear as they pass under your transducer.
Those items on the right side of the screen are closer to you than those on the
left.) Fish are displayed as a darkened arch or a fish icon in three different sizes.
Thermoclines are shown as shades of gray.
The area of strongest sonar return (or whiteline) is displayed as a mix of light
and dark checkering. Typically, the bottom will be the primary whiteline. A thin
whiteline indicates a soft bottom while a thick whiteline shows a harder bottom. A
black line is used to show the point were the water meets the whiteline. This
black line will follow the contour of the bottom and show any objects of reason-
able size. Along the right side of the screen is an adjustable scale which reflects
the depth of the area being displayed. The status bar at the bottom of the page
displays satellite signal status, digital depth, and any triggered alarms.
A. The right side of the screen represents the trans-
ducer’s location on your boat. Items appearing
on the right side of the screen were passed by
more recently than those on the left.
B. The four-level gray LCD screen makes it possible
to easily separate sonar targets from their
surroundings.
25
A
B
SECTION
3
SOUNDER PAGE
Overview and
Range Modes
Data Field
Whiteline
Thermocline
Status Bar
Fish Icon
Range Mode
Black Line
GPS 135 Rev C 8/4/98 4:17 PM Page 25

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