Humminbird Platinum ID 120 Operation Manual page 25

3. Selecting Sensitivity
Factory Setting: +0
The Platinum ID automatically adjusts to the
proper amount of sensitivity for conditions (ie
depth). You can bias the setting + or – 5 levels
to suit your personal taste. Increasing the
sensitivity adjustment can cause the display of
very small targets and thermoclines which
might not be displayed at the +0 setting.
If you want to manually adjust Sensitivity,
select SENS and press the Up or Down arrow
button to adjust the display.
4. Enabling Bottom Alarm
Factory Setting: OFF
The Bottom Alarm lets you specify the
minimum depth you want to maintain. To use
it, select BOTTOM ALARM; then press the
ON-OFF button to activate the alarm, and the
Up or Down arrow button to adjust the depth at
which the alarm will sound. A dashed line
appears at the alarm depth when the function
is on.
When Bottom Alarm is on, you'll hear a
continuous chirping sound when the bottom is
shallower than you defined. This is very handy
for alerting you to shallow water or helping you
to maintain position over structure.
USING THE PLATINUM ID 120
OPERATING INSTRUCTIONS