I load Basecamp (on a PC because it doesn't want to recognize my Xt on the Mac

Connect XT. All working great.
I do not import or export *anything.* Basecamp shows the standard installed Garmin maps. The "internal storage" is empty.
And yet the XT has series of tracks from one of my GPX files. WTF! Can I delete these. No way

Start it up - and the #$%^ tracks reappear. #$^#&#%#&%
And then it dawned on me. Log onto explore.garmin.com. And there they are. These tracks are quietly being "resynced" wirelessly.

So I delete tracks in Explore. And Presto! All tracks deleted. Happy days.