I have tried several times and with 2 different SD cards with a couple failures. This is on a Helix 7 with latest firmware.
If I select ALL (waypoints, routes and tracs) I get a failure to open on humminbirdpc 2.5 , although some waypoints come up.
If I select a specific route, I get a partial listing with 2 routes instead of 1. this does load onto hmpc2.5
The sd card saves into a folder called matrix but the files are not .GPX files but HWR.