Edit the Track

Editing consists of Trimming, Filtering and Removing Track Scatter, the edit order is not particularly important.

Removing Track Scatter

Track scatter occurs in a number of ways, if you stop, say for lunch, and leave the GPS on, it will create numerous points around your position simply because the satellites are always moving. Another cause is less than optimal satellite reception, say a narrow canyon. My example will use the latter.

If you look at the track above the text "State Trust Land" in the screenshot above, something doesn't look right.

Zooming in from 0.5 mi to 500 ft we can see a very unlikely track with the highest point 400 ft above the stream bed. Track scatter.

To remove the track scatter, click the pink eraser tool, from the five track edit tools, upper-right, and select as many points that you want to delete. The blue points will all be deleted, leaving only the thin wire connecting the first and last point. Don't like the result, click Undo and start over. Since you created the track, you're the only person who can make the decision what to delete.


If you double click on the selected track in the table, you'll bring up the Track Properties spreadsheet. On the lower right click the Filter radio button to see the Track Filter dialog:

You can filter by Time, Distance, Max Points or Automatic with a slider. If you don't like the results, click Undo. If you look on the lower left of the Track Properties spreadsheet > Points, you'll see the starting point count in your track, when you click OK, the filter will reduce the point count, instant feedback. Basically, you want the minimum number of points to accurately describe your track.


Using the above example, both an inbound and outbound track were created, you only want one. Use the scissors tool, go to the turn-around point and cut the single track into two tracks. Delete one, retain the other.

Another use for trimming is when part of your track is already on the map, delete that portion of your track that already exist on the map. A small overlap is good.

Tip 1: Let's assume you want to use a portion of both the inbound and outbound tracks. Simply use the scissors tool to cutout the unwanted segments, delete those, then use the "+" tool above to splice together a single new track.

Tip 2: Let's assume you want to use two track segments from two different days, when you open one the other closes. Open two instances of Mapsource and Copy - Paste the second into the first.

Joining Two Tracks


To join two tracks, use the "+" tool and select first one track then click on the end of another. If it starts at the wrong end, use the Esc key first, then select the other end.


In the block below the Library list, select the two tracks, then right click > Advanced > Join the seleted tracks. The tracks will be joined in time based order, arbitary joining is only possible in MapSource. It might be possible to manually change the time stamp to force arbitary joining?

Moving Track Points

This can only be done in BaseCamp. Select the Move Tool, and click a track point and move it.