Temp. Alarm (With Optional-Purchase Temp/Speed Only); Off Course Alarm - Humminbird 688ci HD DI Operation Manual

Temp. Alarm sounds when the water temperature from the paddlewheel
detected by the Fishfinder reaches the Temp. Alarm setting, which is either set
in degrees Fahrenheit or Celsius (International Models only).
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.
Off Course Alarm allows you to set how far the boat is allowed to move off
course before the Off Course Alarm will sound during navigation.
Temp. Alarm
(with optional-purchase Temp/Speed only)
Settings: Off, 33 to 120 Fahrenheit, 0 to 50 Celsius
(International Models only); Default = Off

Off Course Alarm

Settings: Off, 25 to 3000 feet, 10 to 1000 meters
(International Models only); Default = 300 ft, 100 m
109
Off Course
Limits
Arrival Alarm
Circle
Alarms Menu Tab