Reference - Garmin eTrex Owner's Manual

Battery Save
When the eTrex is in 'BATTERY SAVE' mode, the GPS
receiver is turned on and off alternatively to conserve
power.
To select battery save mode:
1. Press the PAGE Button and switch to the 'MENU'
Page. Use the UP and DOWN Button and highlight
the 'SETUP' fi eld. Press ENTER. The 'SETUP' Page
appears.
2. Press the UP or DOWN Button and select the
'SYSTEM' fi eld. Press ENTER. The 'SYSTEM' Page
appears.
3. Press ENTER on the 'MODE' fi eld. Press the UP
or DOWN Button to select 'BATTERY SAVE'. Press
ENTER. Press PAGE to return to the page of your
choice.
Demo Mode
The 'DEMO' mode is designed for dealers to show
the features and functions of the eTrex to potential
customers inside a closed building where satellite
reception is not possible. There is no navigation possible
in 'DEMO' mode.
If you select the 'DEMO' mode, a window appears at
the bottom of the screen asking you to verify that you
want to turn the GPS off (the unit will stop tracking
satellites, not power off). To do so, press ENTER.
Congratulations! You now know all there is to know about
the GARMIN eTrex.

Reference

Demo Mode
The eTrex's batteries will
last up to 22 hours in
'BATTERY SAVE' mode
(when using alkaline
batteries).
The 'DEMO' mode is
designed for GARMIN
dealers.
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