Setting up a GPS Unit and Basic GPS Mapping Techniques Manual 1
This manual is intended to provide users with a basic understanding of a Garmin eTrex GPS receiver and how it can help to support day to day operations. For detailed information about this receiver, refer to the owner's manual that is included with the receiver.
What is a Global Positioning System?
The Global Positioning System is a space-based global navigation satellite system. It provides reliable location and time information anywhere on Earth and at all times when there is an unobstructed line of site to at least four GPS satellites. It was created by the U.S. Department of Defense in 1973.
How it works?
The Global Positioning System consists of three segments: 1. Space Segment The space segment is composed of orbiting satellites positioned in medium Earth orbit at an altitude of approximately 20 200 kilometers (12 550 miles). The satellites orbit around the Earth in six circular planes broadcasting the signal from space. Each satellite makes two complete orbits each day. About eight satellites are visible at any particular time from any point on the ground. 2. Control Segment The Control Segment is composed of: • Control Stations • Dedicated Antennas • Dedicated Monitor Stations The control segment tracks the flight paths of the satellites and regularly contacts each satellite with a navigational updates. 3. User Segment The user segment is composed of tens of millions of users on-the-ground, in-the-air, water etc.
Setting up a Garmin e-Trex GPS unit
These are the basic steps on how to set up a Garmin eTrex GPS unit. These steps are specifically addressed for achieving best results when collecting track logs and waypoints for OpenStreetMap. For a full description of the settings please consult the Owners Manual or check the site:
Getting Started 2.1.1
Installing batteries and a microSD card
The eTrex operates on two AA batteries which are not included. To install the batteries: ➢ Remove the battery compartment cover from the back of the unit ➢ Insert the batteries, observing the proper polarity The SD card should be included in the Garmin eTrex folder bundle. It should be installed in the slot on the left side of the batteries. To install a microSD card: ➢ Remove the battery compartment cover from the back of the unit ➢ Locate the card slot at the upper-left edge of the battery tray, and slide the card into the slot 2.1.2
Transferring data to and from the GPS unit
To transfer data to and from the device:
➢ Lift the weather cover from the USB unit on the back of the unit ➢ Connect the USB cable to the USB port on your computer and the USB port on the back of the unit ➢ Transfer the data
Installing the batteries and a microSD card 2.1.3
Initializing the GPS Receiver
When the satellite is turned on for the first time, the receiver must collect satellite data and establish its location. To receive the satellite signals you must: ➢ ➢ ➢ ➢
Be outdoors and have a clear view of the sky GPS is now searching for the satellite signals The Locating Satellites is replaced by Acquiring Satellites message Once the connection is established the Location and Coordinates appear in the Acquiring
Acquiring Satellites Window
Loading a Map
OpenStreetMap data is free to use however you like. Important! The changes need to be released under the OSM license. OSM data can be transformed into map files compatible with Garmin GPS devices. CloudMade (http://cloudmade.com) is one of the companies that produces free Garmin maps for a large number of countries. Download a map: ➢ To find maps of the area, load http://downloads.cloudmade.com and browse the maps. The Garmin maps are in .img format. ➢ Once the area of interest is found, download the appropriate file to the computer. ➢ Unzip the file, this will extract the file called gmapsupp.img Load the map onto the Garmin device by putting the device into USB Mass Storage mode, and copying over the file: ➢ Press Menu twice or Page key until arriving to Main Menu ➢ Select the Setup icon, press Enter, then select the Interface icon, and press Enter ➢ Connect the GPS to the Computer via USB cable, highlight the USB Mass Storage button and press Enter, the device shows up on a system as a drive ➢ If it doesn't exist create a folder called Garmin on the device ➢ Copy the downloaded gmapsupp.img file to the Garmin folder; if the file already exists you might want to archive the existing file ➢ Disconnect the GPS or press the Power button to restart the unit - the map should be available
Map Setup Set up a map on the Map Page: ➢ Press Quit/Page key until arriving at the Map Page ➢ Press Menu/Find key, select Setup Map and press Enter/Rocker key Use the Rocker key and move it left and right between different Map setups. Setup: General Setup ➢ Use the Rocker key (left and right) to move from icon to icon on the top menu and select the
General Setup ➢ Move the Rocker key down to highlight Orientation, press Enter, select North Up and press Enter again ➢ Then highlight Lock On Road, press Enter, select Off and press Enter again. Turning Lock On Road ON would automatically align the tracklog with the nearest road present on the map loaded into the GPS unit. By turning the Lock On Road OFF will record new data even in the presence of existing roads. Tracks Setup ➢ ➢ ➢ ➢
Use the Rocker to move back to the Icon Menu on top Select Track Setup Move the Rocker down to highlight Track Points and press Enter Use the Numeric Keypad to enter 10000 and press Enter
10000 is the maximum number of track points that can be recorded in the GPS units internal memory. The limit of the track points recorded to the microSD card is only limited by the size of the card.
Track Log Setup
These steps make sure that the Garmin eTrex is recording track logs with a sample rate once per second and recording the track logs to the data card. Setting the frequency of the track log recording to the highest possible (one second) will ensure the most complete track recording.
Track Log Setup First make sure the Track Log is being recorded: ➢ Press Menu twice or Page key until arriving to Main Menu ➢ Select Tracks icon and press Enter ➢ If Track Log is set to Off, move the Rocker to highlight On, and press Enter Next, configure the Track Log recording: Highlight the Setup button, and press Enter to open the Tracklog Setup Page Highlight Wrap When Full, and press Enter so that it is Checked Highlight Record Method, press Enter, select Time, and press Enter Highlight Interval, use the Numeric Keypad to set interval to 00 hrs 00 min 01 sec, and select OK ➢ Highlight Color, press Enter, select your choice, and press Enter ➢ ➢ ➢ ➢
Finally. Configure the Data Card: ➢ Highlight the Data Card Setup button, and press Enter to enter the Data Card Setup Page ➢ Highlight Log Track To Data Card, and press Enter so that it is Checked
System Setup ➢ ➢ ➢ ➢ ➢
Press Menu twice or Page key until you arrive to the Main Menu Select the Setup icon, and press Enter, then select the System icon, and press Enter Highlight GPS, press Enter, select Normal, and press Enter again Highlight WASS/EGNOS, press Enter, select Enabled, and press Enter again Highlight Battery Type, press Enter, select depending on your battery type (most rechargeable batteries are usually NiMH, while the normal ones are Alkaline)
Units Setup To set up Measuring Units: ➢ ➢ ➢ ➢ ➢ ➢ ➢ ➢
Press Menu twice or Page key until you arrive to the Main Menu Select Setup icon, press Enter, then select the Units icon, and press Enter Highlight Position Format, press Enter, select hddd.ddddd°, and press Enter Select Map Datum, press Enter, select WGS 84, and press Enter Select Distance/Speed, press Enter, select Metric, and press Enter Select Elevation, press Enter, select Meters (m/min), and press Enter Select Depth, press Enter, select Meters, and press Enter Select Temperature, press Enter, select Celsius, and press Enter
Time Setup Press Menu twice or Page key until you arrive to the Main Menu Select Setup icon, press Enter, then select the Time icon, and press Enter Highlight Time Format, press Enter, and select 24 Hour Highlight Time Zone, press Enter, and select a city in your time zone. If no obvious choice is listed, select Other, and press Enter ➢ Highlight UTC Offset, press enter, and use the Numeric Keypad to manually set your timezones offset. When finished, select OK. ➢ ➢ ➢ ➢
Welcome screen setup
Welcome Setup ➢ Press Menu twice or Page key until you arrive to the Main Menu ➢ Select Setup icon, and press Enter, then select Welcome icon, and press Enter ➢ Use the Alphanumeric Keypad to enter a message
Basic GPS mapping techniques
The basic mapping techniques described are specifically addressed for achieving the best results when collecting points of interest, ways and areas, using a hand-held GPS units, such as the Garmin eTrex device.
Collect satellite data and establish location
The steps to initialize the GPS receiver are already described above (Initializing the GSP receiver). Before you set out to map, you need to initialize the GPS receiver, meaning, the receiver must collect satellite data and establish its location. To receive the satellite signals: ➢ ➢ ➢ ➢ ➢
Be outdoors and have a clear view of the sky! Turn the GPS device on by pressing the Power button GPS is now searching for the satellite signals The Locating Satellites is replaced by Acquiring Satellites message Once the connection is established the Location and Coordinates appear in the Acquiring
Satellites Window You are ready to map!
Collecting satellite data and establishing location
Collecting Points of Interest
Points of Interest (POI) are points/locations which are of special interest and usually the reason for conducting a mapping exercise. They are either physical points or events, placed somewhere in space and time. Some examples of Points of Interest are hospitals, schools, water points, toilets, shops, religious institutions, and even events, such as, demonstrations, clashes, rallies, etc. By mapping we determine the exact location of Points of Interest in space and time.
There are many different ways to collect Points of Interest. This step explains how to collect these points , also known as waypoints, using a hand-held GPS unit. To collect a point: ➢ Stand in front of an object you wish to collect ➢ Press Enter key and hold it for one second until you arrive to Mark Waypoint screen ➢ Write down on a piece of paper (or into Waypoint Log Sheet) the number and the name of the point you are collecting (You can move up to the waypoint number field by using the Rocker key, and press Enter. Alphanumeric and Numeric Keypads appear. You can use these keypads to type in the name of the location you are mapping but for the sake of saving time it is better to use a sheet of paper and a pencil) ➢ OK should be highlighted, press Enter to save the location
Collecting Points of Interest Example of a GPS Waypoint Log Sheet:
Waypoint Log Sheet
Ways are lines connecting different locations. Ways can be highways, roads, paths, railway lines, bus lines, ship lines, bicycle routs, hiking trails etc. Before you start collecting ways, you need to set the Track Log as described above in the Track Log Setup. Once the device is set to record track, all you need to do is walk along the way you wish to map, and the device does the rest. For maximum efficiency try walking in the middle of the way you are collecting, but DO NOT PUT YOURSELF IN DANGER!
An area is an enclosed space usually of the same attribute/land use. Areas can be forests, lakes, seas, parks, fields, buildings, parking lots, squares, playgrounds, etc. There is a couple of ways to collect an area with a GPS unit but the fastest and the easiest are: Collect a point in the middle: ➢ Collect a point in the middle of an area you want to map, estimate the dimensions and draw an approximate sketch of an area on a piece of paper This method is good for smaller areas like playgrounds but it's not very precise. Collect points on the perimeter of the area: ➢ Walk around the perimeter of an area and collect points at the edges of an area ➢ Write the waypoints of the edges of an area on a piece of paper
Collecting a point in the middle of an area and sketching out an area:
Collecting a point in the middle and sketching out an area Collecting points on the perimeter of the area:
Walking the perimeter of an area and collecting points at the edges
GPS Manual Final.pdf - Map Kibera
Setting up a GPS Unit and Basic GPS Mapping Techniques Manual 1
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