What does "positive control" mean?

The air traffic control practice of controlling aircraft whose positions are determined by direct radar observation.

Positive control

Common synonyms include: benchmark, confirmatory, more positive control, positive control condition, reference, reliable.

noun

noun ·Rare ·Advanced level

Noun

1
The air traffic control practice of controlling aircraft whose positions are determined by direct radar observation. uncountable
2
In dog handling, the state of having affirmative physical or non-physical control of a dog. uncountable