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EC devices are intended for voluntary carriage on registered and non-registered UK Annex II aircraft, non-complex EASA aircraft of <5700kg MTOM and for gliders and balloons (including those covered under ELA 1 and ELA 2) within uncontrolled UK airspace. An EC device cannot be used at the same time as a transponder and it doesn't replace the need for a transponder when required by airspace/flight rules.