Valsts valodas centra izstrādātie transporta, infrastruktūras un sakaru termini

Konteksts: [..] distance circles at 20-km or 10-NM intervals or, when practicable, 10-km or 5-NM intervals shown as fine dashed lines with the radius indicated on the circumference and centred on the identified aerodrome main VOR radio navigation aid or, if not available, on the aerodrome/heliport reference point [..]
Avots: Annex 4 to the Convention on International Civil Aviation - Aeronautical Charts