They work by radar.

Sir, we're being radarscanned.

Artillery mortar radar

Radar contact was lost in the vicinity of Pale.

Artillery mortar radar location unit

Shortly thereafter, radar and visual contact was lost.

NATO fighters were sent to investigate but, due to weather conditions, made radar contact only.

AWACS also reported a radar contact at the same position.

Radar contact was lost for operational reasons 73 kilometres south east of Sarajevo.

NATO fighters were sent to investigate and made radar contact.

NATO fighter aircraft were sent to investigate but made radar contact only.

Fighter aircraft were vectored onto the contact and they also gained radar contact on their own equipment.

The fighters maintained radar and visual contact while issuing warnings.

South west AWACS made radar contact with an aircraft flying 45 kilometres west of Sarajevo.

NATO fighters subsequently made radar and visual contact with a camouflaged green helicopter.

27 Sept. AWACS made radar contact with an aircraft 45 kilometres west of Sarajevo.

Various AWACS made radar contact with an aircraft 45 kilometres south east of Sarajevo.

AWACS made radar contact with an aircraft flying 15 kilometres west of Zenica.

AWACS made radar contact with an aircraft 6 kilometres north east of Zenica.

AWACS made radar contact with an aircraft 35 kilometres south west of Zenica.

AWACS made radar contact with an aircraft 20 kilometres west of Brcko.

NATO fighter aircraft were sent to investigate and made radar contact only.

AWACS made radar contact with an aircraft 20 kilometres south west of Medugorje.

AWACS and NATO fighters made radar contact with an aircraft flying 40 kilometres south of Sarajevo.

AWACS made radar contact with an aircraft, probably a helicopter, taking off from Zenica.

NATO fighter aircraft made radar contact 5 kilometres north of Tuzla.

AWACS made radar contact with an aircraft 32 kilometres south of Gorni Vakuf.

AWACS made radar contact with an aircraft 35 kilometres south west of Zenica.

AWACS made radar contact with an aircraft 25 kilometres south west of Gorni Vakuf.

AWACS made radar contact with an aircraft 40 kilometres south west of Gorni Vakuf.

AWACS made radar contact with an aircraft 7 kilometres south of Vitez.

AWACS made radar contact with an aircraft flying 18 kilometres west of Sarajevo.

1,000 feet AWACS made radar contact 10 kilometres east of Mostar, heading north.

AWACS made radar contact with an aircraft 60 kilometres south east of Sarajevo.

Radar contact was lost a few minutes later, 45 kilometres south west of Tuzla.

NATO fighters made radar and visual contact with a helicopter 43 kilometres south west of Zenica.

AWACS made radar contact with an aircraft 30 kilometres west of Mostar.

West AWACS made radar contact with an aircraft 40 kilometres west of Mostar.

AWACS made radar contact with an aircraft flying 25 kilometres south of Zenica.

AWACS made radar contact with an aircraft flying 20 kilometres south of Zenica.

AWACS made radar contact with an aircraft flying 20 kilometres south west of Zenica.

AWACS made radar contact with an aircraft flying 30 kilometres west south west of Mostar.

7,100 ft. AWACS made radar contact with an aircraft flying 40 kilometres north of Mostar.

NATO fighter aircraft made radar contact with an aircraft 25 kilometres south east of Zenica.

AWACS made radar contact with an aircraft flying 12 kilometres north east of Gorni Vakuf.