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Main Menu
The Main Menu contains the unit settings that usually do not require frequent change. The Main Menu
is divided into eight tabs: Graph, Tools, Temp, Alarms, System, Units, Sonar and Time. Each tab is described
in more detail in this section.
To enter the Main Menu, press and hold the ADJ/MENU key. The first time you enter the Main Menu,
the ‘Graph’ tab is highlighted in black. Press the UP or DOWN ARROW keys to highlight different tab selec-
tions. Press the RIGHT ARROW key to access the selection fields. Each time the Main Menu is accessed, the
unit returns to the last edited selection field. Press the LEFT ARROW key to get back to the tabs.
To change a setting on a Main Menu tab:
1. Using the ARROW keys, highlight the desired fi eld and press ENTER.
2. Highlight the desired setting and press ENTER.
3. Press ADJ/MENU to return to the Sonar display or to cancel data entry.
Graph Tab
The Graph Tab allows you to determine the appearance of the scrolling graph display and contains the
unit settings that usually do not require frequent change.
The following settings are available:
• Fish Symbols — allows you to determine how the graph shows underwater targets and back-
ground information. If Fish Symbols are set to ‘Off’, the unit displays all of the available informa-
tion about the underwater environment. If a fi sh symbol is selected, the graph displays only the
information related to that symbol. Actual fi sh returns may not always appear as perfect arches (like
in simulator mode), due to the speed, fi sh orientation and/or other conditions.
• Scale — controls the presentation of the depth ‘Scale’ displayed vertically along the right side of the
graph. The depth ‘Scale’ can be confi gured to display four different ways: ‘Overlay’, ‘Corners’, ‘Basic’
or ‘No Scale’.
• Custom Range — allows you to specify a custom viewing range/scale. Once enabled, this range is
displayed as ‘Custom’ in the ‘Range’ adjustment control. The left value is the top of the scale and the
right value is the bottom of the scale.
Unit Operation
Main Menu Options
Main Menu - Graph Tab
Fish Symbols Off— All available information is
displayed.
Suspended targets are displayed as fi sh symbols.
Background information is displayed.
Same as above with the target depth attached.
Suspended targets are displayed as fi sh symbols. No
background information is displayed.
Same as above with target depth attached.
250C Manual.indd 16 1/27/2004, 3:55:09 PM