[PAR] [TLE] RAF Bovingdon [SEP] Royal Air Force Bovingdon or more simply RAF Bovingdon is a former Royal Air Force station located near the village of Bovingdon, 2.5 mi south of Hemel Hempstead, Hertfordshire and 2.5 mi southeast of Berkhamsted, Hertfordshire, England. [PAR] [TLE] Bovingdon stack [SEP] The Bovingdon stack is a section of airspace to the north west of London where inbound planes to London Heathrow Airport, which is 20 miles (30 km) to the south, are held.  It is a busy example of a hold.  It extends above the village of Bovingdon and the town of Chesham, and requires the VOR navigational beacon BNN which is situated on the former RAF Bovingdon airfield.  At busy times on a clear day a dozen planes may be circling overhead.  Other holding patterns serving Heathrow are at Biggin Hill, Kent (BIG - SE Arrivals), Lambourne, Essex (LAM - NE Arrivals) and Ockham, Surrey (OCK - SW Arrivals), where inbound aircraft will normally use the pattern closest to their arrival route.  They can be visualised as invisible helter skelters in the sky.
[PAR] [TLE] RAF Bovingdon [ SEP ] Royal Air Force Bovingdon or more simply RAF Bovingdon is a former Royal Air Force station located near the village of Bovingdon , 2.5 mi south of Hemel Hempstead , Hertfordshire and 2.5 mi southeast of Berkhamsted , Hertfordshire , England . [PAR] [TLE] Bovingdon stack [ SEP ] The Bovingdon stack is a section of airspace to the north west of London where inbound planes to London Heathrow Airport , which is 20 miles ( 30 km ) to the south , are held . It is a busy example of a hold . It extends above the village of Bovingdon and the town of Chesham , and requires the VOR navigational beacon BNN which is situated on the former RAF Bovingdon airfield . At busy times on a clear day a dozen planes may be circling overhead . Other holding patterns serving Heathrow are at Biggin Hill , Kent ( BIG - SE Arrivals ) , Lambourne , Essex ( LAM - NE Arrivals ) and Ockham , Surrey ( OCK - SW Arrivals ) , where inbound aircraft will normally use the pattern closest to their arrival route . They can be visualised as invisible helter skelters in the sky .
Which beacon is located 2.5 miles south of Hemel Hempstead, Hertfordshire?
Which beacon is located 2.5 miles south of Hemel Hempstead , Hertfordshire ?
the VOR navigational beacon BNN
the VOR navigational beacon BNN