Your recorded tracks are saved on two locations, one is the 'Tracks' folder on your SDcard for the porpose of exporting the track-data.

As a backup the unit is saving the tracks also in a coded binary format in the 'Navi' Folder of the SDcard.

To delete your tracks finally, please delete the file 'Tracks.bin' in the 'Navi' folder. Please make sure, that the navigation software is not running during this moment!

Please do not delete any other file in that folder, these are important systems files with your personal configuration, waypoints and system settings.?