Correct me if I'm wrong (Dave Parer, where are you?), but aircraft which come up in your search, with no location, are non ADS-B equipped aircraft. So if I'm correct Olivier, these aircraft do NOT have ADS-B. They do transmit some sort of info which detects them though, hence why they'd appear on your little display thing, but with no location data etc.
Cheers
Mick
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