NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 62)

Page 58 491 Echo Sounder Operations Manual
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.
Setting inside or
outside fish
markers
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.
Turning the fish
alarm on and off
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.
The alarm 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.
Setting the bottom alarm
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.