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Radar lock-on
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<p>Lock-on is a feature of many <a href="/facts/Radar/jk9BTbFA">radar</a> systems that allow it to automatically follow a selected target. Lock-on was first designed for the <a href="/facts/AI_Mk._IX_radar/56cxM5ck">AI Mk. IX radar</a> in the UK, where it was known as lock-follow or auto-follow. Its first operational use was in the US ground-based <a href="/facts/SCR-584_radar/dSltypTF">SCR-584 radar</a>, which demonstrated the ability to easily track almost any airborne target, from aircraft to artillery shells. </p>