Fish Id; Downscan Options - Lowrance Mark-4 HDI Operation Manual

Amplitude Scope
Displays the amplitude of the
most recent echo.

Fish ID

Displays fish echoes as fish symbols instead of fish
arches.
Fish ID is not the most accurate
method of fish detection since
structure and suspended debris
may be shown as a fish symbol
on the display.

DownScan options

You can make adjustments to DownScan overlay
settings from the sonar page. DownScan options
are covered in more detail in the "DownScan
Operation" section.
Sonar Operation | Mark-4 & Elite-4 HDI
Amplitude
scope
Stop Sonar
Pauses the unit's sonar, allowing you to get a closer
look at suspended targets. Stop Sonar also can be
used to prevent/stop interference between two
sonar units running on the boat at the same time.
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DownScan options menu
nOTe: The DownScan options menu
will only be available when DownScan
overlay is enabled.
nOTe: Sonar history will not be
recorded when sonar is stopped.