Standard Horizon FF520 Owner's Manual page 26

The Range options are:
Range Mode : Selects among Manual, Auto Range and Bottom Lock. In Manual Range Mode is possible to set
Shift (the offset from the surface) and depth on which the Fish Finder shall operate. In Auto Range
Mode the Fish Finder determines automatically the range as to keep the bottom visible in the lower
bottom of the screen. In this mode, Shift is always set to 0. In Bottom Lock Mode the Fish Finder
automatically tracks the range around the bottom specified by the Bottom Range value.
Depth : This option is available only when Range Mode is Manual and it is disabled in Auto Range and
Bottom Lock Mode. When Range Mode is Bottom Lock, Depth and Shift options are replaced by
Bottom Range.
Depth Mode : This option is available when Range mode is Manual
Manual: The bottom search is done inside the range selected by th euser
Auto: The bottom search in done inside the full range of the FIsh FInder capability (0-4000ft)
Shift : Offset from the surface.
Bottom Range : This option is available only when Range Mode is Bottom Lock. It is the range around the Bottom
Line that has to be tracked by the Fish Finder.
The options under Range Mode change depending on the current Range Mode.
4.4 SENSITIVITY
The Sensitivity menu is accessible both from the Fish Finder Setup menu and by pressing [ENTER]
when in Fish Finder pages. All settings in the Sensitivity menu are related to the Frequency.
Frequency
Gain Mode
Gain (*)
Gain Offset (*)
Noise Treshold
STC
Interf Rejection
If the Gain Mode option is set to Auto, the Gain Offset field is active. The default Gain Offset is zero.
If the Gain Mode option is set to Manual, the Gain field is active. When switching from Automatic
to Manual mode, the Gain + Offset value is copied into the Manual Gain setting of the receiver.
4.5 ALARMS
The Alarms menu allows you to define alarm settings for Shallow Alarm, Depth Alarm and
Temperature Upper/Lower/Rate. To set an Anchor Alarm, enter in a shallow water and
depth value above and below your actual anchoring depth. The alarm will sound if the anchor
is dragged shallower or deeper than the settings.
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Figure 4.4 - Sensitivity sub-menu
: Allows to choose on which frequency operate the changes.
: Selects Auto or Manual.
: Allows you to control the sensitivity of the unit's receiver. To see more detail, increase the
receiver sensitivity by selecting a higher gain percentage. If there is too much detail or if
the screen is cluttered, lowering the sensitivity may increase the clarity of the display.
: Allows increasing or decreasing the Sensitivity in Auto Gain mode, by adding a positive
or negative value to the internal Gain setting.
: It can be turned in to a percentage setting.
: Sensitivity Time Constant: it is a time varying gain curve which attenuates the sonar
receiver gain in shallow water, increasing the gain gradually as the depth increases. This
is for the purpose of filtering out surface clutter.
: Selects a filter to remove noise from other sources to external noises.
NOTE (*)
NOTE
FF520