Garmin GPSMAP 3005C - Manual (Page 85)

GPSMAP 3005C Owner’s Manual 
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• Depth line—adds a horizontal depth line across the screen that is used to
measure the depth of underwater objects. The depth of the line appears on
the right side of the line. Press up or down on the ROCKER to control the
position of the line on the Sonar Page. To turn the Depth Line off, press the
ROCKER up until the setting bar is all the way at the top of the range and
reads Off.
Depth lne
Zoom—sets a screen zoom scale. The following settings are available:
• Off—turns off the Zoom function.
• 2x Zoom––displays the 2x zoomed picture.
• 4x Zoom––displays the 4x zoomed picture.
• Btm (Bottom) lock––displays the Bottom Lock (returns from the
bottom up) picture. When using this setting, “BL” appears at the bottom
of the screen.
• Zoom View—available when you select a Zoom scale other than Off. You
can use the Zoom View setting to change the viewing range of a zoomed
display. Auto follows the water bottom. If the display is Bottom lock, the
Span setting adjusts how far off the bottom the unit shows data.
• Tools—controls the display of useful sonar tools. The following options are
available:
• A-scope—when you turn on A-scope, a vertical flasher bar appears on
the far-right side of the screen. This flasher displays structure and
bottom returns much the same as the Flasher Page. The horizontal width
of the A-scope signal indicates the strength of the signal.
• Color Bar—shows a gradient scale of the current Color Gain setting.
• Temp Graph—appears only if you have a temperature-capable
transducer. This setting toggles the display of a temperature graph on or
off on the bottom of a Sonar Page, and it matches the scrolling data.
• Setup—opens the Sonar tab.
To adjust the range:
On the Sonar Page, press the up RANGE key to decrease the range, or
press the down RANGE key to increase the range.
The unit can be set to automatically track the bottom (Auto) or set to a
user-specified depth range.
Using the Pointer on the Sonar Page
You can use the pointer (arrow) to reference sonar items and mark underwater
waypoints. This makes it easier to find and use an object, such as a stump, as a
future fishing location. When using this feature, the Sonar Page pauses. The depth
continues to update while the display is paused, but the unit does not show any
new sonar data until the Sonar Page resumes scrolling. Discontinuity is possible
from where the sonar information stops and where it starts again.
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