Zoom; Chart Speed - Humminbird PiranhaMAX 197c Installation And Operation Manual

Zoom provides a magnified view of the bottom and structure.
Auto: Select Auto to magnify the area around the bottom in order to reveal fish
and structure close to the bottom that may not be visible during normal
operation. When ZOOM is set to Auto, the upper and lower Depth Ranges are
automatically adjusted to keep the area above and below the bottom on the
display. Select Off to return to normal operation.
Manual: There is also a series of manual ranges which can be selected. The
manual depth ranges are determined by the present depth conditions.
Magnified Bottom
with More Detail
Chart Speed determines the speed at which the sonar information moves
across the display, and consequently the amount of detail shown.
A faster speed shows more information and is preferred by most anglers;
however, the sonar information moves across the display quickly. A slower
speed keeps the information on the display longer, but the bottom and fish
details become compressed and may be difficult to interpret.
X-Press Menu

Zoom

Settings: Off, Auto, Manual Ranges; Default = Off

Chart Speed

Settings: 1 to 5, where 1 = Slow, 5 = Fast; Default = 5, Setting
Saved in Memory
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Upper Zoom Range
Structure
Lower Zoom Range