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09/25/02 GPS_field_guide 8:19 A9/P9
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CHAPTER 3: THE GARMIN ETREX UNIT
The Garmin eTrex GPS receiver has been chosen for the WHO WHS because it is easy to
use and inexpensive.
Its utilisation in the context of different surveys operated in the field has proven its
suitability for this kind of work. This device is completely waterproof, runs for
approximately 22 hours on two AA alkaline batteries and can operate under dense tree
canopy.
The present section describes the receiver as well as the operating system allowing the user
to measure the geographic co-ordinates. Information about how to use the receiver is
provided in the Quick Reference Guide and in the GPS data collection protocol.
3.1 Overview of the unit
One of the advantage of this receiver is the reduced number of elements and buttons on
the unit (Figure 9 and 10)
Figure 9 - Front view of the Garmin eTrex device