Garmin GPSMAP 2006 Owner's Manual & Reference page 39

Reference
Sonar Adjustment Options
Sonar Page with Dual and Split Frequency
and Bottom Lock.
Only information on the left side of the
sonar split will be used for data fields and
Map Page splits when the unit is set to
'Maximun Detail'.
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• 2X Split––Shows two reduced-size sonar pictures at the same time. The right half of the display
screen shows the complete sonar picture at its original scale. The left half shows a portion of the
original picture at 1/2 depth scale.
• 2X Zoom––Displays the 2X zoomed picture on the full GPSMAP 2006/2010 screen and does not
show the original scale picture unless 'Dual Frequency Display' is set to 'Split', then a 50/200kHz
split screen will show.
• 4X Split––Shows two reduced pictures, the right at the original depth scale and the left at 1/4 the
original depth scale.
• 4X Zoom––Displays only the 4X zoomed picture on the full GPSMAP 2006/2010 screen, unless
'Dual Frequency Display' is set to 'Split', then a 50/200kHz split screen will show.
• Btm (Bottom) Split––Shows two reduced pictures, the right at the original depth scale and the left
showing sonar returns from the bottom up. All target depths will read as a distance from the bottom
in the left window.
• Btm (Bottom) Lock––Displays only the Bottom Lock (returns from the bottom up) picture on the
full GPSMAP 2006/2010 screen, unless 'Dual Frequency Display' is set to 'Split', then a 50/200kHz
split screen will show.
Once activated, the zoomed picture becomes the Sonar Page display. Note: The Zoom function can be
deactivated by pressing the OUT key until the 'No Zoom' setting appears.
3. View/Span— available when a Zoom scale other than 'No Zoom' is selected. The 'View' or 'Span'
setting is used to change the viewing range of a zoomed display. If the display is 2X or 4X split, only the
zoomed portion on the left side of the display will be affected by the change. If the display is Bottom Split
or Bottom Lock, 'Span' will adjust how far off the bottom the unit will display data.
4. Gain— allows you to control the sensitivity of the unit' s receiver. This provides some flexibility in
what is seen on the display. To see more detail, increase the receiver sensitivity by selecting a higher gain
percentage. If there is too much detail or if the screen is cluttered, lowering the sensitivity may increase the
clarity of the display.
5. Target Level— adjusts how dark/light a return (or target) is displayed on the screen. A Color Bar
(see also page 27) will appear on the right side of the screen as you adjust this setting. The higher the
percentage, the darker the return will appear. This setting does not increase/decrease the unit Gain.