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  9. Garmin eTrex - Hiking GPS Receiver User manual

Garmin eTrex - Hiking GPS Receiver User manual

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Test and Use of the GPS in the Field
© WHO 2002
16-09-03 GPS_test_and_use.doc 10:28
2
World Health Organization
Geneva, Switzerland
This document was prepared by F. Naville et S. Ebener
This report contains the views of experts, and does not necessarily represent the decisions or the stated policy of
the World Health Organization.
Test and Use of the GPS in the Field
16-09-03 GPS_test_and_use.doc 10:28
3
1. Introduction
This document is a complement to the GPS Field guide and GPS Data Collection
Protocol. It describes the steps to be followed just after the presentation in order to test
the GPS devices before going into the field and the steps to be followed in the field for
collecting the geographic location of the selected households.
This document makes reference to the GPS Field Guide, the GPS Data Collection
Protocol and the Country Information Form that you will therefore need to have with you
as well as the GPS device that has been given to you for the survey in order to follow the
steps described.
16-09-03 GPS_test_and_use.doc 10:28
4
2. Test of the GPS unit
Once the training is finished you can start
to prepare the
eTrex and check that it is
functioning properly.
First install the batteries:
Remove the battery cover by turning the
D-ring at the back of the unit ¼ turn
anti-clockwise. Insert the batteries into
position
observing proper polarity
.
Attach the battery cover by turning the
D-ring ¼ turn clockwise.
Then find a large
open area
close to the
training site with a clear view of the sky.
Make sure that you are in an open area
without obstacles hiding the view of the
sky and not in the middle of structures
like buildings.
2.1)
2.2)
2.3)
2.4)
16-09-03 GPS_test_and_use.doc 10:28
5
Hold the eTrex unit parallel to the ground and the screen facing upwards.
Always use the unit in this position.
Press and hold the
POWER
button to turn
on the unit. The ‘WELCOME’ page will
display followed by the ‘SATELLITE’
page.
(For the description of the different buttons
and pages please refer to chapter 2, section
1 and 2 of the ‘GPS Field Guide’).
Wait until the message ‘READY TO
NAVIGATE’ appears. If this message
does not appear and/or another one
appears, refer to chapter 4 section 4.1 to
4.4 of the ‘GPS Field Guide’.
Then make sure the accuracy is lower
than 20m. If this is not the case, please
refer to chapter 4 section 4.4 of the ‘GPS
Field Guide’.
2.5)
2.6)
2.8)
The ‘SATELLITE’ page
The ‘WELCOME’ page
2.7)
16-09-03 GPS_test_and_use.doc 10:28
6
Before using the
eTrex,
set-up the
working units
as shown on the picture. To
do so refer to page 20 of the ‘GPS Field
Guide’.
If the lighting conditions make it hard for
you to see the screen you can refer to page
16 of the ‘GPS Field Guide’.
Press and hold the
ENTER
button in
order to directly access the ‘MARK
WAYPOINT’ page on which the
coordinates are displayed.
Verify that the units displayed are the
same as on the figure.
Now make sure that the
coordinates displayed are within the range of the ‘Country
Information’ form (that you received with the whole set of GPS training documents). If
this is not the case, please refer to chapter 4, section 4.7 of the ‘GPS Field Guide’.
2.10)
2.11)
2.9)
16-09-03 GPS_test_and_use.doc 10:28
7
If the coordinates displayed are within the range of the ‘Country Information’ form,
then your eTrex is initialised properly.
Your eTrex is now ready to be used in the survey.
You should go to the field with:
- The eTrex device
- The ‘GPS Data Collection Protocol’
- This present document : ‘Test and use of the GPS in the field’
- The ‘Country Information’ form
- Batteries (full set)
You can now go to the selected cluster.
2.12)
2.13)
16-09-03 GPS_test_and_use.doc 10:28
8
3. Use of the GPS in the field
Once you have reached the cluster and
before starting collecting the geographic
information of the selected households, it
is very important to follow the same
procedure as during the test as the unit
may need to be initialised again due to the
travelling distance. So find a large open
area with a clear view of the sky.
Turn on the unit and wait until the
message ‘READY TO NAVIGATE’
appears. If this message does not appear
and/or another one appears, refer to
chapter 4 section 4.1 to 4.3 of the ‘GPS
Field Guide’.
Then make sure the accuracy is lower
than 20m. If this is not the case, please
refer to chapter 4 section 4.4 of the ‘GPS
Field Guide’.
Press and hold the
ENTER
button in order
to access the ‘MARK WAYPOINT’ page.
If the
coordinates are not in the desired
units refer to page 20 of the ‘GPS Field
Guide’. Then make sure the
coordinates
are within the range of the ‘Country
Information’ form.
Your eTrex is now ready and you can
start to collect geographic readings.
Move to the first selected household in
the cluster.
3.1)
3.4)
The ‘SATELLITE’ page
3.3)
3.2)
16-09-03 GPS_test_and_use.doc 10:28
9
Once in front of the household, fill in section 0100 of the questionnaire, “
Sampling
Information”, concerning the household as follows:
Q0100-Q0103: Sampling. Fill in the name and/or code of each sampling level.
Here is an example in South Africa: Imagine that one of the cluster is part of the
Gauteng
Province which corresponds to the Primary Sampling Unit.
3.5)
3.6)
16-09-03 GPS_test_and_use.doc 10:28
10
Inside this Province the cluster is situated in the Pretoria Metropolitan Council
(Secondary Sampling unit (SSU)).
And we named this cluster n° 001 (Tertiary Sampling Unit (TSU)).
3.8)
3.7)