Garmin ETrex - Hiking GPS Receiver Manual de usuario

Test and Use of the GPS in the Field

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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

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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.

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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