A couple of days ago we added support for tracks in InstaMapper. To define a track, go to the data explorer (login -> "Devices" -> "[data]"), then select the endpoints. After a track is saved, it can be shared just like your current location. Here is an example:
You can also link to a track (http://www.instamapper.com/trk?key=13916004634505324941) and export a track as a GIF image:
Tracks can contain up to 10,000 points. There is no limit on the total number of tracks in an account.