The satellite images are interesting. The ob<x>ject may or may not actually exist; the images are, at best, difficult to make out.<br />
If part of the plane if found, they'll have to calculate currents because debris has now had days and days to drift. We're still talking about an immensely difficult search area.
airports and airplanes around the world use antiquated radar tracking technology, first developed in the 1950s, rather than modern GPS systems.
Still, radar can ping a plane every 4-12 seconds. And by 2020, GPS will be widely in use.
UPDATE: Australian authorities have found two ob<x>jects that may be from the missing Malaysia Airlines Flight 370, Australian Prime Minister Tony Abbott announced on March 19. Surveillance aircraft has been sent to locate the ob<x>jects, which were seen on satellite imagery, according to the UK’s Daily Mail.
They should have brought other countries and especially the USA into it earlier. I think in the end in will be the wonky math dudes working off the barest of satellite data that hone the search area and make the find possible.