NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 64)

Page 60 491 Echo Sounder Operations Manual
Turning the bottom
alarm on and off
To turn the alarm on, at the BOTTOM ALARM window, press
TURN ALARM ON. To turn the alarm off, press TURN ALARM
OFF.
The alarm When the bottom is detected, the alert tone sounds and the
message “Bottom Collision!” is displayed. This message clears
automatically after 20 seconds, and the alarm is reset.
Setting the temperature alarm
When the temperature alarm is set, an alarm sounds if the
echo sounder detects that the water temperature has either
risen above or dropped below the limit you’ve set.
To set the temperature alarm:
1. At the ECHO screen, press MORE.
2. Press ALARM.
3. At the ALARM screen, press TEMP ALARM.
The options on the TEMPERATURE ALARM window are
on/off, upper and lower limits, and inside or outside limits.
Temperature alarm window
This alarm isn’t present
unless a temperature
sensor is installed and
configured.