ED Decision 2025/010/R
USE OF COMMERCIAL OFF-THE-SHELF (COTS) POSITION SOURCES — PRACTICAL EVALUATION
The tests should consist of a statistically relevant sample of taxiing. It is recommended to include taxiing at aerodromes that are representative of the more complex aerodromes typically accessed by the operator. Taxiing segment samples should include data that is derived from runways/FATO and taxiways, and should include numerous turns, in particular of 90 degrees or more, and segments in straight lines at the maximum speed at which the own-ship symbol is displayed. Taxiing segment samples should include parts in areas of high buildings such as terminals.
The analysis should include at least 25 inbound and/or outbound taxiing segments between the parking location and the runway/FATO.
During the tests, any unusual events (such as observing the own-ship symbol in a location on the map that is notably offset compared to the actual position, the own-ship symbol changing to non-directional when the aircraft is moving, and times when the own-ship symbol disappears from the map display) should be noted. For the test, the pilot should be instructed to diligently taxi on the centre line.
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