Garmin Etrex Legend - GPS Receiver Istruzioni operative

GPS Tutorial: Basic Applications

Garmin models covered

1. eTrex Legend

2. eTrex Venture HC

3. eTrex High Sensitivity

Coordinate Systems

•Geographic CS: spherical (3-dimensions), such as latitude and

longitude

•Projected CS: flat (2-dimensions), such as UTMs

•Requires a GCS and map projection (to go from 3 to 2 dimensions)

•Map projections are customized for a particular location/region

•The coordinate system you use depends on where you are and what

you’re doing – there is no single system that is right for every context.

Want to know more?

resources.esri.com/help/9.3/arcgisengine/dotnet/89b720a5-7339-44b0-8b58-0f5bf2843393.htm

www.progonos.com/furuti/MapProj/Normal/TOC/cartTOC.html

•Coordinate system (CS): reference system used

to represent locations on earth.

•Provides common basis for communication

about a particular place or area.

Coordinate Systems

www.extension.umn.edu/youth/mn4-H/projects/docs/geospatial-GPS-coordinate-systems-explained.pdf

(Lat and Long)

GCS: Decimal degress (lat and long) PCS: UTMs

“Easting” is 6 digits but

often has leading 0.

Wyoming UTM zones

W (12) E (13)

Garmin eTrex

Legend and HC

•After turning on the GPS (power button

circled in red), click through pages using the

page (or quit) key.

•Pages should be similar to this:

Main Screens

Satellite Map Navigation

Trip

computer Main menu

eTrex Legend

•Use toggle to move between options

in a menu

•Push toggle in to select

eTrex HC

•Navigate with up and down arrows

•Press enter to select

Moving between and selecting options in a menu

1. Navigate to Main Menu

with page button

Before Anything Else, Set the Coordinate System

In ‘Position Format’ select the coordinate system you’re using. For example,

UTM UPS for UTMs (PCS) or hddd.ddddd° for decimal degrees (GCS).

After change Position Format, select your Map Datum. For UTM UPS, you

likely want NAD 83. For hddd.ddddd, you likely want WGS 84.

The coordinate system is now set. You do not need to do anything extra to

save the settings –simply navigate to the next page you need with the page

button.

2. Select ‘Setup’ 3. Select ‘Units’

4. Change units

•Regardless of the screen you are

on, push in and hold toggle

(legend) or enter button (HC)

“Mark Waypoint” screen will

pop-up:

How to Add a Waypoint by Entering Coordinates

1) Toggle until the numbers within the flag are highlighted, then

push toggle in. Name point then select ‘OK’.

2) Toggle until the field next to ‘Location’ is highlighted, push

toggle in. Move highlight box off of ‘N’ so box is on 1st number.

Enter the desired N coordinates (Latitude), enter W

coordinates (Longitude) on next line. Click ‘OK’ when done.

- This screen shows decimal degrees. Screen will look slightly

different for other coordinate systems but apply same steps.

3) After the point name and coordinates are entered, click ‘OK’ on

the main screen to save the waypoint.

•This follows similar steps as the previous slide but 1st the

GPS must find enough satellites.

•On the satellite page, the upper field will say “Waiting to

find satellites” if the GPS is still looking.

•Once enough are found, the upper field will change to

“Ready to Navigate” (this could take 5-10 min depending

on location and conditions).

•The upper field also reports accuracy. Before marking

your location, wait for accuracy to be below ~20 feet.

•Once accuracy is acceptable, push and hold the toggle in

for ~2 seconds. Name the point and then click ‘OK’ on the

main screen to save. Unlike the previous slide, do not edit

coordinates in the location field –those coordinates

already represent your current location.

How to Add a Waypoint for your Current Location

•After saving a waypoint, click the page button

(circled in red) until you get the Main Menu page:

How to Navigate to a Waypoint, Part 1

1) Click on ‘Find’

2) Click on ‘Waypoints’

3) Another window will pop-up, if choose ‘Nearest’, it will return a list of

points in order of how close they are to your current location. If choose

‘By Name’, it will return a list of points that you can search through. To

search by name, toggle so the field under ‘Waypoints’ is highlighted,

push toggle in, enter name.

4) Once find point need, toggle so point name is highlighted, push toggle

in. Click ‘Goto’ on new screen that pops-up.

eTrex Legend

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