Humminbird LCR 100 Operation Manual page 6

3. Enabling Fish Alarm;
Factory setting: OFF
The Fish Alarm alerts you with a chirping sound whenever
the LCR 100 detects fish (or another object not attached to
the bottom). To activate it, select FISH ALM and press the
ON-OFF button. A fish symbol reminds you that the alarm
is on.
The fish alarm is especially helpful in identifying targets
near the bottom or structure that might not be apparent
unless the zoom or bottom lock mode is selected.
4. Using Zoom;
Factory setting: OFF
Zoom provides an up-close view. To activate it, select
Zoom and press ON-OFF: The Zoom view initially
begins at the surface; pressing the Up or Down arrow
adjusts Zoom depth. The range of the display is shown
when Zoom is on.
The Zoom range depends on the current Depth Range:
7 1/2' in the 15' and 30' Depth Ranges, 15' in the 60'
and 120' Depth Ranges, and 30' in the 180' to 600'
Depth Ranges. (Metric display: 3m in the 6m and 9m
ranges, 5m in the 15m and 30m ranges, and l0m in the
45m to 185m ranges.)
Remember: If Zoom is the last function selected, you
can use the arrow buttons to adjust the Zoom depth or
ON-OFF to switch Zoom on and off without having to
press SELECT first. The word zoom will be shown on
the display when the zoom function is enabled.