Garmin NavTalk Owner's Manual page 105

6.13.2 Timers Settings
User Timer - lets you select a count up or count
down timer. For a count down timer you may also spec-
ify the count down duration.
To select a user timer setting:
Battery Timer - provides a running count of how
long the NavTalk has been in operation with the current
batteries. The timer automatically stops when using an
external power source. The timer will automatically
reset when depleted batteries are replaced, but can also
be manually reset.
To select a battery timer setting:
Since Midnight - provides a running count of how
long the NavTalk has been in operation since midnight
of the current day.
Since Factory Reset - provides a running count of
total NavTalk operating time since the receiver was
shipped from the factory.
SECTION 6