taswegian wrote:@FLICKIT I'm curious what your post of Fri 13 May, 2022 11:59 pm has to do with Sheffield?
Looks ridiculous IMO

I'm certainly no expert but this is what I believe..
The aircraft transmit an ADS-B signal which includes identification, GPS co-ord, speed, altitude and such.. I believe most aircraft tracking is done by these ADS-B transmissions these days rather than airport radars:
https://en.wikipedia.org/wiki/Automatic ... 3Broadcasthttps://www.casa.gov.au/search-centre/s ... -and-ads-bThese transmissions are received by ADS-B ground stations which are scattered around the place, airports and such, around Tassie they're few and far between...
The transmissions from aircraft around the OLT area seem to be received by the Queenstown ground station when they're in the south, or Sheffield when further north, when the aircraft drop down into a valley or such and tracking is lost the tracking sites list their arrival/landing location as the location of the last ground station that received a transmission from the aircraft, which is why Sheffield is shown for so much of the OLT..The tracking is good for aircraft at high altitude due to them having good line of sight to the ground stations, but down low when the aircraft are between mountains and such the tracking is fairly flakey, the weather seems to play a part also... Some days you can follow the helicopters on the tracking sites right to the helipads at the huts on the OLT, other days they vanish off the trackers as soon as they drop down between the mountains up there..
Edit: It looks like I might be wrong on this, it appears the landing/arrival location may just be listed as a nearby airport or airstrip, and not based on the last ground station to receive a transmission as I thought... Looking at the data from that flight you commented on it looks like the ADS-B transmissions were received by the Darlington/Maria Island ground station for most the flight, and then Zeehan towards the end:
https://flightaware.com/live/flight/POL ... 4/tracklog