Echo JS 0.11.0

Why not splitting the image into tiles of... dunno, 1/4 of screen size (256x192 or 512x384 each), then align and display only two screens at once (so you will have 4 tiles on screen, then two more tiles in each direction + one in each corner; that is 16 tiles).

Also, Google maps can deal with this kind of stuff. Take a look here: http://quartermaester.info/