▁A ircraft ▁information , ▁which ▁may ▁include ▁position ▁from ▁G N SS ▁or ▁other ▁means ▁is ▁determined ▁on ▁board ▁and ▁then ▁transm itted ▁to ▁A TC ▁in ▁response ▁to ▁inter rog ation . ▁Other ▁co oper ative ▁systems ▁such ▁as ▁A DS - B ▁rely ▁on ▁aircraft ▁transm itting ▁their ▁position ▁and ▁other ▁information ▁without ▁inter rog ation ▁from ▁the ▁ground . ▁ ▁Non - co oper ative ▁systems ▁Non - co oper ative ▁systems ▁( a . k . a . ▁independent ▁surve ill ance ): ▁Under ▁this ▁form ▁of ▁surve ill ance , ▁systems ▁on ▁the ▁ground ▁( such ▁as ▁PS R ) ▁are ▁able ▁to ▁locate ▁the ▁aircraft ▁and ▁measure ▁its ▁position ▁from ▁the ▁ground ▁by ▁transm itting ▁p uls es ▁of ▁radio ▁waves ▁which ▁reflect ▁off ▁the ▁aircraft ' s ▁h ull . ▁ ▁See ▁also ▁ ▁Air ▁traffic ▁management ▁ ▁References ▁ ▁External ▁links ▁Air ▁traffic ▁management ▁Category : A viation <0x0A> </s> ▁B ain tha ▁B rak k ▁() ▁or ▁The ▁O gre ▁is ▁a ▁ste ep , ▁c rag gy ▁mountain , ▁ ▁high , ▁in ▁the ▁Pan ma h ▁Mu zt agh , ▁a ▁sub range ▁of ▁the ▁Kar ak or am ▁mountain ▁range . ▁It ▁is ▁located ▁in ▁Gil git - B alt istan , ▁Pakistan . ▁It ▁is ▁famous ▁for ▁being ▁one ▁of ▁the ▁hard est ▁pe aks ▁in ▁the ▁world ▁to ▁clim b : ▁twenty - four ▁years ▁el apsed ▁between ▁the ▁first ▁as cent ▁in ▁ 1 9 7 7 ▁and