Humminbird 700 SERIES 798CI - Manual (Page 135)

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Temp. Alarm
Temp. Alarm sounds when the water temperature
detected by the Fishing System reaches the Temp. Alarm setting, which is either
set in degrees Fahrenheit or Celsius [International Models only].
To change the Temp. Alarm setting:
1. Highlight Temp. Alarm on the Alarms main menu.
2. Press the LEFT or RIGHT Cursor keys to change the Temp. Alarm
setting. (Off, 33-120 [Fahrenheit], 0-50 [Celsius], Default = Off)
For example, if the Temp. Alarm is set to 58 degrees Fahrenheit, and the water
temperature falls from 60 degrees to 58 degrees, the Temp. Alarm will sound.
Similarly, if the water temperature rises from 56 degrees to 58 degrees, the Temp.
Alarm will also sound.
Alarms Menu Tab