Just to clarify ... or perhaps to confuse? --
The Explorer essentially has three distinct sets of navigational data: Explorer-created lines called tracks, website-created lines called routes, and waypoints (which can be created -- and then commingled -- either by the Explorer or at the website).
1. Tracks can be synced to the website and then exported to a gpx file. The track memory can also be cleared on the Explorer to declutter the map view and free up memory. (However, for the latter concern, any track logging interval less than a minute prompts a warning about more rapid depletion of the battery, yet even a 10-second interval still provides an estimated week of tracking memory, and even a one-second interval provides an estimate day of memory.)
2. Routes can be created, edited, and deleted on the website, synced to the Explorer, and deleted on the Explorer. (An in-progress navigation to a website also shows up in the route, but then disappears once navigation is ended, although that disappearance could be a function of my navigation not having entailed actually going anywhere.) No possibility though for exporting the route out from the website via a gpx file (or any other way), and no possibility for importing route data from a gpx file (or any other way). To create a route more precise that just clicking on map features: a) if the goal is to create a saved route from an Explorer-created track, then you can click away to essentially create a new line overlaid on the recorded track; if the goal is to replicate a previously created track in a gpx file, you can create a series of temporary waypoints from the individual tracklog points, then play connect-the-dots with your drawn route.
3. Waypoints can be created, deleted, and edited on either the Explorer or the website, and synced back & forth. Waypoints created on the Explorer are automatically uploaded via the Iridium satellite network to the user's map page on the DeLorme website (and ditto for in-progress navigational "routes"), with no way currently to override this automated (and bafflingly free) uploading. The only way to import or export waypoint data to or from an outside source is to copy & paste the coordinates.