GPSBabel is a free software for GPS data conversion and transfer. As Garmin Training Center for Mac is not supported any more, you can use GPSBabel as an alternative way to send your fitness data to TrailRunner. To send your ForeRunner workout data to TrailRunner, follow these steps:
> Go to http://www.gpsbabel.org
> Go to Download
> Scroll down and download the current GPSBabel+ dmg Package for Mac OS X
The package contains two applications, gpsbabel and GPSBabel+.app
In your applications Folder, create a new folder named GPSBabel
Move the two apps into that folder.
Download and install the TrailRunner support script
> open http://www.trailrunnerx.com/SendToTrailRunner.app.zip
> Move the application SendToTrailRunner.app to the same GPSBabel folder as above
Send workout data from your ForeRunner to TrailRunner
> Connect your ForeRunner with your USB port.
> Double click the SendToTrailRunner.app
GPSBabel should now download your stored fitness data and open the TrailRunner Workout import.
If you get an error message, unplug and pug your ForeRunner with your USB port.
Please note that GPSBabel will download raw fitness data from your ForeRunner and TrailRunner has to calculate all average, maximum and calorie values. This will almost always differ from the devices values as Garmin does some fancy mathematics almost impossible to reproduce by just using the raw workout data. (see FAQ on this)