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GPS Track Log

A gps track log is a collection of track points along the course of a route. It’s essentially a bread crumb trail of the path of the route to be navigated. Track logs can tell us where we have been and therefore how to get back to where we started. More importantly, if prepared in advance, a track log can tell us where we need to go.

Track Logs are most often created by a GPS instrument as the user navigates a desired route or path. It’s a recording of the path navigated. Not all GPS instruments utilize track logs. Some instruments only give the user an active track log with no ability to save the track log as an individual file.

The various GPS instruments handle track logs in different ways. Even within a manufacturers product line, the track log functions are different mainly due to product evolution. Some instruments only allow the user to work with an Active or Main track log. Other units allow the user to save track logs.

The Garmin GPS III+ and earlier units do not allow tracks to be uploaded to saved logs, so all uploaded tracks go to the main or active track log. It’s important to remember to save each individual track log from the Active log if you intend to have multiple track log files available on the instrument.

There are limits on how many track points can exist in a track log file. Many units allow more track points in the active log than the saved log. When a track log is saved the number of track points (resolution) is reduced to a number less than or equal to the maximum number of units allowed for a saved log. Early Garmin units allowed 250 track points in a saved log.  Some of the higher end units like the Garmin 176C allow for 500 track points in a saved log file.

On the later Garmin units, you can load track logs directly into saved logs in the gps instrument. These files must not be over the maximum number of track points otherwise the file will be truncated. It’s a good idea to have track logs stored on your computer in a reduced format (less than or equal to the maximum number of track points allowed in a stored track log for the intended instrument).

Also, you must keep in mind that any track uploaded which does not have the name ACTIVE LOG will be sent to a 'saved track' log on the Garmin units capable of uploading to stored log files.
 
Track Log Sample #1
 
Above is a Garmin MapSource screen shot of the Black Bear Pass trail track log in Southwestern Colorado. It shows the actual path of the trail from US Hwy 550 west to the Pandora Mine on the eastern edge of Telluride Colorado. (Note the switchbacks southeast of the Pandora Mine).
 
Track Log Sample #2
 
Above is a Delorme StreetAtlas screen shot of the same track log display.
 

Why waypoints aren’t good enough .....

 
Track Log Sample #3
 
Above is a screen shot from MapTech’s Terrain Navigator showing a section of the Floy Wash trail near Green River, Utah. Assume we are traveling in a west-to-east direction. At the waypoint FWWE11,which direction should we go?

(Note that in the real world, the difference of the two paths is not that apparent, in other words, the 4WD route doesn’t look much different than the more improved road you have been traveling on. Note also that there is a mountain to the east so you can’t see what happens to the trail much beyond the intersection.)

A decision has to be made. At the waypoint (intersection ‘Y’) the route directional line follows the direction of the 4WD trail. Would you take the 4WD trail at that intersection?

 
Track Log Sample #4
 
Above is a screen shot of the same trail including the track log. It’s obvious from the track log path which way we should go. That’s the importance and value of the track log. It removes uncertainty.

The first time we traveled this route, we did not have a track log of the route. We took the 4WD trail which led us up a canyon along a sand wash that became more and more technical the further east we traveled. The trail eventually lead to a dead end. All that was lost was a little time and a lot of energy fighting our dualsport bikes in the sand.

Hopefully this will convey the importance and added value that our track logs add to the G-Guides we offer. All G-Guides have complete track logs as well as waypoints.

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Modified On: Sunday, March 2, 2014 3:09 PM
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