Sonar Page - Garmin Fishfinder 320C Owner's Manual And Reference Manual

Sonar Page

The Sonar Page is where your Fishfi nder 320C becomes a powerful fi shfi nder/fl asher. If the unit does
not detect a transducer, a "Sonar Turned Off" message will appear across the Sonar Page. If in Simulator
mode, a 'Running Simulator' message will appear after 2 minutes of inactivity.
The top left of the screen contains numbers or data fi elds, such as Depth, Water Speed and Water Temp
(see pg. 14), while the currently selected Adjustment (see pg. 10) option will appear in the upper left of
the display. 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.) Along the right side of the screen is an adjustable scale which refl ects
the depth of the area being displayed.
The sonar 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. 11). For example, you
may choose to show dual frequency at a 2X zoom (Dual 2X) on one half and normal range dual frequency
(Dual) returns on the other half. The current display mode will be displayed at the bottom of each sonar
display.
Sonar returns will show as red (strongest), then oranges (strong), yellows (medium), greens (weaker)
and blues (weakest). The ' Fish Symbols' option (see page 15) allows you to view the actual sonar data, a fi sh
symbol or a combination of both. 'Fish Symbols' will appear as green. When the unit is set to 'Dual' (see
page 12), the appearance of the fi sh symbols (and simulated fi sh returns) will change. Fish symbols from the
narrower beam (200kHz) will be solid (or narrow returns), but the returns from the wider beam (50kHz)
will be hollow (or wide returns). Simulated fi sh icons are displayed in three different sizes. Actual fi sh
returns may not always appear as perfect arches, due to the speed, fi sh orientation, and/or other conditions.
More on understanding the sonar may be found on pages 21-24.
Unit Operation
Describing the Display
Current
Adjustment
Option
Numbers
Bottom
Narrow beam
returns
Fish Symbol
Depth
Scale
Fish Arches
(Simulated)
Flasher
Thermocline
Wide beam
returns
Frequency
mode
9