Setting The Bottom Alarm - NorthStar Echo Sounder 491 Operation Manual

Setting inside or
outside fish
markers
Turning the fish
alarm on and off
The alarm

Setting the bottom alarm

Page 58
2. Press the CURSOR PAD up or down to set the depth, or
use the KEYPAD to manually enter the desired depth.
The depth is displayed in the tab below the SET UPPER
MKR key.
To set the depth of the lower marker:
1. At the FISH ALARM window, press SET LOWER MKR.
The lower marker window is highlighted in black.
2. Press the CURSOR PAD up or down to set the depth, or
use the KEYPAD to manually enter the desired depth.
The depth is displayed in the tab below the SET LOWER
MKR key.
If you designate the markers as inside markers, the fish alarm
sounds when fish are detected within these markers. If you set
these markers as outside markers, the fish alarm sounds when
fish are detected outside of these markers.
To set the markers to inside or outside, at the FISH ALARM
window, press INSIDE/OUTSIDE MKRS to toggle between the
inside and outside settings. The setting is displayed in the tab
below the INSIDE/OUTSIDE MKRS key.
To turn the alarm on, at the FISH ALARM window, press TURN
ALARM ON. Generally, you'll want to turn the alarm on after
making all the other settings.
To turn the alarm off, press TURN ALARM OFF.
When fish are detected, the alert tone sounds and the message
"FISH!" is displayed. This message clears automatically after 20
seconds and the alarm is rearmed.
When the bottom alarm is set, an alarm sounds if the echo
sounder detects that the bottom is shallower than the limit
you've set.
491 Echo Sounder Operations Manual