The licenses for UAS operators, depend upon the Maximum Take Off Mass of the UAS and are issued for the following categories:

ΜΤΟΜ of UASCATEGORYHOURS OF THEORETICAL TRAININGPRACTICAL TRAINING
Up to 1 kg (<1)UAS Pilot A503
From 1 kg (= / 1 kg) to 4 kgs (<4)UAS Pilot B507
From 4kgs (=/>4kgs) to 25 kgs (<25)UAS Pilot C5012