(alph2z) If you plot a straight great circle line from NILAM to the magnetic south-pole you get extremely close to the search site of Ocean Shield* (last satellite ping not shown but passes over search site).
NILAM (western tip of Indonesia) is at the upper left of the image. Search site is small yellow thumbnail west of northern Australia. Magnetic south-pole is in lower right corner of image.
[180 degree magnetic heading from western tip of indonesia]
IMHO, I don't think so: magnetic declination is very low (around 1°W) near Bandah Aceh:
http://upload.wikimedia.org/wikipedi...8/Mv-world.jpg
With a 180° magnetic heading from western tip of Indonesia, you will fly quite true South at the beginning, with the track slowly turning East and more and more faster. I don't know how to draw the track on GEarth map.