Hummingbird Communications Humminbird 300 Benutzerhandbuch

26

Upper Range sets the shallowest depth range that will be displayed on the Sonar,
Split Sonar, Big Digits and Circular Flasher views. The Upper Range menu choice is
available when User Mode is set to Advanced (see Setup Menu Tab: User Mode) and
can only be accessed from the Sonar, Split Sonar, Big Digits and Circular Flasher
views. Upper Range is often used with Lower Range. 

1.  Make sure you are in Advanced Mode, then highlight Upper Range on the

Sonar X-Press

TM

Menu.

2.  Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the

Upper Range setting. (0 to 990 feet or 0 to 327 meters [International Models
Only], Default = 0) 

For example, if you are only interested in the area between 20 and 50

feet deep, you should set the Upper Depth Range to 20 and the Lower
Depth Range to 50.  The Sonar View will then show the 30 foot area
between 20 and 50, and will not show the surface or the bottom
(assuming the bottom is deeper than 50 feet), and will show greater
detail for that area between 20 and 50 feet.

25

Sensitivity controls how much detail is shown on 

the display and will adjust the sensitivity of all sonar frequencies. Increasing the
sensitivity shows more sonar returns from small baitfish and suspended debris in
the water; however, the display may become too cluttered. When operating in very
clear water or greater depths, increased sensitivity shows weaker returns that may
be of interest. Decreasing the sensitivity eliminates the clutter from the display that
is sometimes present in murky or muddy water. If Sensitivity is adjusted too low, the
display may not show many sonar returns that could be fish.

1. Highlight Sensitivity on the Sonar X-Press

TM

Menu.

2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the

Sensitivity setting. (Low = 1, High = 20, Default = 10)