Hello Tracker users,

The Tracker 5.0.3 upgrade is here and I recommend that you upgrade soon as this fixes a couple of important bugs. It also improves autofilling data gaps (missing steps) and adds several new preferences including default point mass footprint, trail length, and data gap options.

To upgrade click the green "Now available" button on the toolbar and choose Upgrade Now. If you don't see the button then open the preferences dialog, go to the General tab, and click the Check Now button. You can also download the tracker-5.0.3.jar from the Tracker home page and copy it manually into your Tracker directory if all else fails. ;-)

Full installers are also available for Windows, Mac and Linux from both the Tracker home page (http://physlets.org/tracker/) and ComPADRE (http://www.opensourcephysics.org/items/detail.cfm?ID=7365).

Keep on trackin'  Doug

Hello Tracker users,

Tracker 5.0 installers for Windows, Mac and Linux are now available from both the Tracker home page (http://physlets.org/tracker/) and ComPADRE (http://www.opensourcephysics.org/items/detail.cfm?ID=7365).

This is a important upgrade and I recommend you install this new version. Here are the biggest changes and additions:

• Tracker now runs right out of the box--no separate Java needed
• Tracker Help is searchable--results include context and links
• User-settable units (length, mass, time) are displayed in fields, plots and tables
• Annotation drawings now include labels and easier control of appearance and visibility
• Calibration sticks are faster to use: click, click, enter to calibrate
• Tracker no longer requires "legacy Java 6" on OS X

Of course not all changes are additions: QuickTime support has been eliminated. RIP.

If you have any problems or questions concerning Tracker, please feel free to contact me :-)

Cheers! Doug