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11
Unit Operation
Understanding the Display
Sonar Page
The Sonar Page is where your Fishfi nder 250/250C becomes a powerful fi shfi nder/fl asher. If the unit
does not detect a transducer, a “Sonar Turned Off” message is displayed on the Sonar Page. If in Simulator
mode, a “Running Simulator” message is displayed.
The currently selected Adjustment option (see pg. 12) is displayed in the top left of the screen. Directly
below the Adjustment option, the screen displays numeric data such as Depth, Water Temperature and
Water Speed (see pg. 17-18). 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. Items on the right side
of the screen are closer to you than those on the left.) Along the right side of the screen is a scale which
refl ects the depth of the area being displayed.
The display may also be set to show a split screen view of a zoomed portion of the sonar, bottom lock
(display scaled from the bottom up), or a combination of these options (see pg. 13). For example, you may
choose to show dual frequency at a 2X zoom (Dual 2X) on one half of the screen, with normal range dual
frequency (Dual) on the other half. The current display mode is shown at the bottom of each sonar display.
The Fishfi nder 250 displays sonar returns as shades of gray; stronger returns are darker, and weaker
returns are lighter. On the Fishfi nder 250C, sonar returns are displayed as red (strongest), then orange
(strong), yellow (medium), green (weaker) and blue (weakest).
The ‘ Fish Symbols’ option (see page 16) allows you to fi nd fi sh by viewing the actual sonar data, a fi sh
symbol or a combination of both. ‘Fish Symbols’ appear as black on the Fishfi nder 250 and green on the
Fishfi nder 250C. When the unit is set to ‘Dual’ frequency mode (see page 14), the appearance of the fi sh
symbols (and simulated fi sh returns) will change. Fish symbols from the narrower beam (200kHz) will be
solid (narrow returns), but the returns from the wider beam (50kHz) will be hollow (wide returns). Simu-
lated fi sh icons are displayed in three different sizes based on the size of the return. Actual fi sh returns may
not always appear as perfect arches, due to the speed, fi sh orientation, and/or other conditions.
For more information on understanding the sonar, see pages 23-25.
Wide beam
returns
Numeric
Data
Depth
Scale
Flasher
Current
Adjustment
Option
Fish Arches
(Simulated)
Bottom
Thermocline
Narrow
beam returns
Frequency
mode
Fish Symbol
250C Manual.indd 11 1/27/2004, 3:55:04 PM