If it is difficult to compute and show the entire track from My Maps, perhaps it would be sufficient to just center the map on the first point in the track using the current zoom level. That at least gets the user to the general location so they can pan/zoom as desired.

from the market place and installed it. I see that for tracks from the database it is possilbe to move the map to show the track after selecting it. For tracks from "My Tracks" on google, however, Locus does not seem to move to the track after checking and loading it and the context menu item that says "Map" for the tracks in the database, says "Share" for the track in My Maps.