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Bosi72 wrote: Commercial radio stations positions were never "a source of navigation".
As per AIP GEN 2.5, radio navigation aids are identified in ERSA FAC section for each location under NAVIGATION AIDS.
On the side note, if you get a question on exam what would you do if you are lost and one of the answers says use commercial radio station from ERSA - that would be an incorrect answer. The correct answer is contact ATC.