Garmin Fishfinder 250, Owner'S Manual

Page: 23 / 46

B
ASIC
O
PERATION
> U
SING THE
A
DJUSTMENT
M
ENU
Fishfinder 250/250C Owner’s Manual 19
250C and black on the Fishfinder 250. When set at Normal or
1-100%
, this option can be used to better determine bottom
hardness. See page 34 for more information on this feature.
•
Frequency
—allows you to choose a sonar operation
frequency. The frequency is the “pitch” of the sound that the
transducer sends and receives. You may choose 200kHz ,
50kHz , or Dual frequency (when using a dual frequency
transducer).
• Depth Line —adds a horizontal depth line across the display
to measure the depth of underwater objects. The depth of the
line is displayed in a box on the right side of the line. When
the
Depth Line
adjustment window is visible, press the Up or
Down ARROW keys to control the position of the line on the
graph.
•
Noise Reject
—helps filter unwanted noise from the graph.
This option can be turned Off , set to Normal (automatically
adjusts for optimum viewing), or set to a fixed 1-100%
setting. Higher noise rejection settings make the unit less
likely to show fish or structures.
• Scroll —adjusts the rate that the graph scrolls from right to
left. If you are sitting still or the graph is moving too fast,
slowing the scroll rate or pausing it can be beneficial.
Auto
automatically adjusts the scroll rate according to the boat’s
speed. (See also “Automatic Scroll Speed Limit” on page 29.)
• Size Split —enables width adjustment of the Sonar page
split screen. This option is only available when a split zoom
is selected. You may adjust the size of the split window
anywhere from 1/4 to 3/4 width from the right half of the
Sonar page.
• Defaults —restores adjustment options back to original
factory settings.
To resize the Sonar page split screen:
1. From the Sonar page split screen, press ADJ/MENU .
2. Using the ARROW keys, highlight the Size Split option
and press ENTER . A small double-arrow is displayed in the
middle of the split line on the screen.
3. Press the Left or Right ARROW keys to move the split line.
Press ENTER when the line.reaches a suitable location.
You may
resize the
split line to
the left or
the right.
Resizing the Sonar page split screen