Not really, the Wikipedia page is a bit short on provinding the whole picture... They used Magnetic Heading difference, with the difference between the setting

Not really, the Wikipedia page is a bit short on provinding the whole picture... They used Magnetic Heading difference, with the difference between the setting sun angle, to determine general direction of the Cessna from the DC-10. Then they used VHF boxing to pinpoint the Cessna. AT this point he was told to Fly NW. This direction alone would probably have saved him. However Navigation at dark over the ocean is an iffy thing so always work it till you get home. So that is what they did. Since the Cessna could not see the fuel trail made by the DC-10 since it was higher up and the pilot could not see through his canopy, they used sunset settings times to further locate the Cessna. Now with this additional directional confirmation Vette could have told the pilot a more exact heading and then, the oil rig location confirmed it. If not for the initial course correction to fly NW the Cessna would have never seen the oil rig and would be somewhere in the ocean today.