How To Use A GPS: Tracks And Routes
Use a Handheld GPS to Get Where You Want to Go and Return to Where You've Been
This is the fourth article in my "How To Use A GPS" series. Here, I'll briefly cover GPS routes and tracks -- what they are, how they're different, and what you can do with them.
GPS brands and models do have some differences in navigation and data entry screens as well as terminology (ie. I have one GPS that uses the term "landmark" instead of "waypoint"), so you'll have to look through your User's Manual and get to know your unit. Still, the concepts below will be the same.
If you have questions, please let me know in the guestbook, so I can improve the series.
GPS Tracks And Routes: What Are They?
And what's the difference?
In How To Use A GPS: Waypoints And Go Tos, we went over traveling from a current position a previously marked waypoint -- a Go To. A Go To is a route.
Basically, a route is determined in advance. On a GPS, it is a direct line between two waypoints. A route does not take topography or obstacles into account. For that reason, it may often be impossible to follow a route exactly. And this is one reason not to continuously stare at your GPS while walking ... so you don't accidentally walk right off a cliff!
Where you actually walk, on the other hand, is a track. So a GPS track is created as you go. Using your navigation screens, you can deviate from the predetermined route as necessary and then later return to it. This is why a route (planned) and a track (actual) will often differ as seen in the image here.
Types Of GPS Routes
As mentioned, a Go To is a route from one point to another, which might be from your current location in the field back to your vehicle or campsite.
Routes may also be multi-leg, meaning they can consist of multiple waypoints, which you may have entered by using coordinates from a map, have previously marked from an earlier trip, or were given by someone else. For example, you may want to create a route from a trailhead to a campsite and then to a favorite fishing spot you found years ago and marked at that time.
Man Overboard -- or MOB -- routes are useful when you want to instantly create and activate a route to the last computed coordinates. MOB waypoints will be created by the GPS and titled something like MOB001, MOB002, etc.
A Backtrack Route starts from the last recorded position in your track history and goes to the starting point using saved "bread crumbs." By following this route, you're retracing your steps.
What You Can Do With GPS Tracks
I'm not referring to the type of GPS tracking used to track cell phones, vehicles or wildlife. Rather, I'm talking about what you can later do with the track created by your handheld unit while you're carrying it around.
For one, a track can be used to BACKtrack. You may have had to significantly deviate from a predetermined route on your way to a location, due to significant topographic or even man-made obstacles. So rather than do a Go To route back to your starting point, you may use the track you created as your return route.
Tracks are often used in Search & Rescue to determine what areas have been searched. When returning to base, we'll often hand our GPS units to our leader, who will download our tracks onto a laptop computer and then display all searchers' tracks to help plan our next moves.
Similarly, by saving your own tracks, you can plan future trips to an area. Or you can share your track information with someone else who might be going there.
You can also upload your tracks to your computer and map them (or map them by hand on a topographic map, if you prefer) and keep "track" of where you've been.
"Many GPS devices come with software that lets you upload files from your device to your PC, and display the data in interesting ways. But none have the display power of Google Earth. This software, downloadable for free, lets you import directly from select GPS devices, or from data files you've saved using your GPS software."
Find out how on GPS.About.com
Other Online Mapping Tools, Software and Products
- Esri: A Complete GIS and Mapping Software System
Including a range of ready-to-use, high-quality data for GIS visualization and analysis projects; a complete system for designing and managing solutions through the application of geographic knowledge; and tools which allow you to add mapping to your
- TNP Terrain Navigator Pro
Regional collections of USGS topo maps and Software for 2-D and 3-D viewing, customizing, printing, and GPS.
iGage topographic maps, GPS and survey accessories, updates for all topo maps, etc.
- Garmin BaseCamp
This free download allows you to plan your next hiking, biking, motorcycling, driving or off-roading trip. You can create routes, waypoints and tracks from your computer and then transfer them to your device. The Track Draw feature lets you trace you
Here's That GPS Navigation Book Again
If you've looked at my previous GPS articles, you've seen this book before. It's the GPS "how-to" text most recommended by our Search & Rescue team's navigation expert.
This book explains all aspects of the GPS system and related equipment. GPS receivers, compasses, altimeters, maps, coordinate systems, and datums are among the major topics covered. Also included are equipment comparisons, and information on how to select the equipment that is right for you. You are provided with clear and simple descriptions of how the GPS system works, and how to make the GPS system work for you. No prior knowledge of land navigation, map reading, or cartography is assumed. Important information is provided about the limitations of GPS receivers, and how to avoid being mislead by your GPS receiver. As a bonus, thousands of actual coordinates that are ready to enter into your receiver are included in several appendices.
© 2009 Deb Kingsbury