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Sky+ UK.
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Yup as I have said many times in the past the tracking sites are perfectly accurate where a satellite is unpowered - so if you want to know where the Envisat satellite is (a dead research satellite but easily visible to the naked eye) then the predicted positional information will be fine.
As soon as a satellite starts manoevering then all orbital predictions are wrong for the the duration of the move plus however long it takes for the TLE calculations to catch up which is normally a week or so.
The thing all tracking site users must remember is the tracking sites are predictions - not real time data. Ive seen orbital information displayed for a satellite in a decaying orbit where the tracking was still "live" several days after it had burned up in the atmosphere! After a week the site was corrected to object DECAYED
As soon as a satellite starts manoevering then all orbital predictions are wrong for the the duration of the move plus however long it takes for the TLE calculations to catch up which is normally a week or so.
The thing all tracking site users must remember is the tracking sites are predictions - not real time data. Ive seen orbital information displayed for a satellite in a decaying orbit where the tracking was still "live" several days after it had burned up in the atmosphere! After a week the site was corrected to object DECAYED