Garmin 300XL Pilot's Manual And Reference page 39

When the count down timer reaches zero, you will be informed with a 'Timer
expired' message. The timer will then begin to count up, displaying the time since it
expired. The timer runs, if not altered, whenever the GNC 300XL is turned on.
The GNC 300XL clock function keeps track of both UTC time (Greenwich Mean
Time or Zulu Time calculated from the satellites) and local time, allowing you to
designate which format to use for all time displays. The local time and date can be set
without displaying local time on other GNC 300XL pages.
To set the local date/time:
N O
1. Press and rotate
C
2. Press twice and rotate
K
3. Use to select either 'utc' or 'local' time to be displayed in the time fields. Press
K O
4. Use and to set the local date. Press
K O
5. Use and to set the local time. Press
C
6. Press to complete.
The GNC 300XL' s trip timer will automatically keep track of the duration of your
current trip and can be configured to run either when the GNC 300XL is on, or when
your ground speed exceeds a specified value (see Section 7).
To view or reset the trip timer:
N O
1. Press and rotate
C
2. Press twice and rotate
time of day, departure time and time en route will be displayed.
E
3. To reset the timer, press
until NAV Menu 2 is displayed.
O E
until 'Clock?' is highlighted. Press
E
.
E
.
until NAV Menu 2 is displayed.
O
until 'Trip time?' is highlighted. Press
C
. To skip resetting the timer, press
.
E
.
Clock function set to display local time in the time
fields of all other GNC 300XL pages.
To reset the trip timer, highlight 'Reset?' and
E
. The current
press E.
.
NAV KEY SECTION
1
Clock Function
Trip Timer
29