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76 GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > ALARM TAB
Alarm Tab
The Alarm tab allows you to define the alarm settings. The Alarm
tab is divided into three sub tabs: System alarms, Nav alarms, and
Sonar alarms.
System Sub Tab
• Clock—provides an alarm for the system clock. Enter a
time in the time field, and turn the alarm on and off from
the control field menu. Remember to enter alarm times in
the same time format (UTC or local) you are using for your
system. The unit must be on for the clock alarm to work.
• Battery—sets an alarm to sound when the battery is
reaching a critical state of discharge.
• DGPS and Accuracy—DGPS alarm sounds when the unit
loses a differential fix. The accuracy alarm sounds when the
GPS position accuracy falls outside the user-set value.
Nav Sub Tab
• Anchor Drag—sets an alarm to sound when you have
exceeded a specified drift distance. Enter a value in the
distance field, and use the control field to turn the alarm on
and off.
• Arrival—sets an alarm to sound when at specified distance
or time away from a destination waypoint. Enter a distance
radius or time for sounding the alarm and use the control
field to set the alarm to Off, Dist (Distance), or Time.
• Off Course—sets an alarm to sound when you are off
the course by a specified distance. Enter a distance in the
distance field and use the control field to turn the off course
alarm on and off.
Sonar Sub Tab
You must be receiving sonar NMEA data for these functions to
work. See “Using Sonar” pages 78-91 for more information.
• Shallow Water/Deep Water—set alarms to sound when
you enter an area of specified depth that is too shallow or too
deep. Enter a depth in the distance fields and use the control
fields to turn the alarms on and off.
• Water Temperature—sets an alarm to sound when the
transducer reports a temperature either above, below, inside,
or outside the specified values.
• Fish—sets alarm to sound when unit detects a fish of the
specified symbol size.