I haven't heard of the Naarding sighting. What happened there?
The Naarding's is the most important post 1936 sighting. It happened in 1982 near a place called Togari* in NW Tasmania. Naarding was a wildlife biologist, and was in the area doing a study of the local bird life, he'd been sleeping in his Landcruiser at the roadside when after being awoken by heavy rain at around 02:00 he decided to use his spotlight to quickly sweep the area immediately surrounding his vehicle.
Naarding tells that his light came to rest on a large male tiger, sandy brown coat, with twelve dark stripes. He also observed a yellow eye shine, and reported that the animal at one time opened its mouth and hissed.
After watching it for some minutes he decided to try for a photograph and reached for his camera, in doing so though he had to take his light off the animal, as his camera was in a bag at his feet. After retrieving his camera he shone his light back to where the animal had been only to see it disappear into the bush.
Photo at the bottom of the page at the link shows where he was parked
http://www.naturalworlds.org/thylacine/history/expeditions/expeditions_and_searches_12.htm
He got out of the car and tried to follow but no luck, nor were there any prints found, but bear in mind it was belting down.
The sighting was kept quiet for the next two years while a major government search took place. The search was headed up by Nick Mooney, and in his own words he failed to find any evidence that he was happy with. This was the last major official search. And four years later the tiger was declared extinct.
Wile Naarding's sighting seems to follow the usual pattern of alleged sightings, where hard evidence is just out of reach because..., personally I don't think that's case. Naarding has never changed his story, doesn't believe the tiger is still out there, and has never tried to profit from his account. I think he's 100% genuine.
As Mooney said in an interview in the 90's on the Chris PacKham documentary 'Beyond the Jaws of Extinction', in the circumstances a mistake couldn't have been made. So it's down to Naarding's veracity. Which as I say, I personally don't doubt. I'm not sure if I agree with Mooney though that a mistake is impossible, I think that's a bit of a sweeping statement, and we know that even trained observers can make errors. And that's the only way I can explain it.
I don't believe Naarding was lying, and I don't think anyone else does either, but based on the evidence as I interpret it I cannot see a thylacine being alive in 1982. The Naarding sighting is an anomaly I can't explain except by considering the above.
*Togari is very, very near to the famous Woolnorth, which was prime tiger country. It was also one of the areas foccused on by the Guiler search of 1980-81.