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Module 1: Basic GPS Theory and Operatio
The overall objective of this exercise is to allow the student
to obtain hands-on experience with a GPS receiver. The student
will learn how to locate his/her position, navigate through a
user-friendly interface, mark a waypoint, navigate to a
predetermined waypoint, and calculate the area of a parcel of
land. It is assumed that the student has had no prior experience
with GPS receivers.
Part 1:
Introduction to Garmin eTrex Legend
Step
1: Satellite Position
a. Turn on the eTrex
Legend by pressing and holding the
Power button.
b. The first screen you
will see will be the Satellite
page. Wait and observe the number and position of satellites
the unit is receiving. The outer ring represents the horizon,
while the inner ring represents an overhead view of the sky at
45 degrees from the vertical. The black bars along the bottom
of the screen represent satellite signal strength. The
satellites you are receiving will be represented by black bars.
Also notice that the latitude, longitude, and elevation are also
shown.
c. When sufficient
satellites are received, Ready to
Navigate will display at the top of
the screen.
Step 2:
Current Location Data (1 pt)
a. Your instructor
will have a pre-selected waypoint to begin your navigation.
b. Write down the
following:
1. Latitude:_________
Longitude: __________ (specify direction)
2. Elevation:__________
3. The numbers of the
satellites you are communicating
with:________________________________
4. What is the current
accuracy in ft. _______ .
Step 3:
Navigate to selected Waypoints (3 pts)
(Instructor
Note: The number of waypoints will change depending upon the
class size. You will want to break the class into groups and
assign them different waypoints.)
a. Push the
Page button to scroll to
the Main Menu.
b. Use the Click Stick
to highlight the Find
icon. Press the Click Stick to select.
c. Select
Waypoints in the Find
dialog box and By Name
in the Waypoints dialog box.
d. The Waypoints dialog
box will show the Waypoints that you will navigate to on
campus. Highlight and select the waypoint assigned to your
group.
e. Highlight and select the
Goto button. The
Navigation screen shows
a
compass with an arrow pointing towards the
direction of the selected
waypoint. The estimated time and distance to
the waypoint is shown at
the top. The Speed and Heading are shown at
the bottom of the screen.
f. Begin walking a direction for at least 50 feet. Follow the
arrow to the Waypoint
You may not be able to pinpoint the exact location due to
receiver error. Write
down the following:
1. Waypoint number:_________
2. What is the
object?_____________
3. What is the
Latitude:________ Longitude:__________ (located on satellite
page)
4. What was the change
in Latitude:_______ and Longitude:_____ between the starting
point and your first waypoint.
g. Use the Page button
to scroll to the Map screen. Use the
zoom buttons to
view your track to the first waypoint.
h. Repeat the above steps to navigate to the remaining
waypoints. Record
the following for each waypoint.
1. Waypoint number:________
2. What is the object?_____________
3. What is the Latitude:________ Longitude:__________
(located on satellite page)
1. Waypoint number:________
2. What is the
object?____________
3. What is the Latitude:________ Longitude:__________ (located on
satellite page)
1. Waypoint number:________
2. What is the
object?_____________
3. What is the Latitude:________ Longitude:__________ (located on
satellite page)
Step 4: Find a New Object:
a. Go to the
Main Menu and select the
Mark icon.
b. When the
Mark Waypoint screen
appears highlight the number and select
it. Give the waypoint a descriptive name. Highlight the black
dot above
the waypoint name and select an appropriate icon that represents
the
waypoint.
c. Select the
OK button to log the waypoint.
d. Go to the
Map screen to see the waypoint mapped.
Step 5: Other features (2 pts)
Area
Calculation:
a. Using the Page button
select the Accessories icon
and then the Area
Calc. icon.
b. Look at the area
identified by your instructor. Write down how many
acres you estimate
this area to be:_______
c. Select
Start when you are ready,
walk the perimeter, and then select
Stop.
d. Write down the actual
size of the area in acres: ______, in sq. ft.: _____
**To change the units, highlight the units with
click stick and scroll until
desired unit is found**
Other Options: (2 pts)
a. Go to Main Menu and
select Accessories.
1. When is Moonrise: _____
2. When is Sunset:_____
3. What is the best time today to go hunting/fishing:_________
Step 6: Trip Computer
Data: (2 pts)
a. Use the Page button to
scroll to the Trip Computer
screen.
b. Write down the following information:
Distance traveled: __________
Moving time: _________
Stopped time: _________
Moving avg.: ________
Overall avg.: ________
Speed: __________
**Instructor Note:
If you have multiple classes you will want to reset the Trip
Computer. Go to Trip Computer screen and select
Menu and
Reset. Check the top four
boxes and select apply**
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