npc_helicoptersensor

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This entity is not in the FGD by default.
See below for instructions on making it available.

npc_helicoptersensor is a point entity available in Half-Life 2, Half-Life 2: Episode One, Half-Life 2: Episode Two, Half-Life 2: Deathmatch, and Half-Life 2: Lost Coast.

Warning:

• The {{{game}}} parameter is inconsistent with the name defined by the {{hl2}} template. This can most likely be fixed by setting the value of the {{{game}}} parameter to Half-Life 2.
• The {{{game1}}} parameter is inconsistent with the name defined by the {{hl2ep1}} template. This can most likely be fixed by setting the value of the {{{game1}}} parameter to Half-Life 2: Episode One.
• The {{{game2}}} parameter is inconsistent with the name defined by the {{hl2ep2}} template. This can most likely be fixed by setting the value of the {{{game2}}} parameter to Half-Life 2: Episode Two.
• The {{{game3}}} parameter is inconsistent with the name defined by the {{hl2dm}} template. This can most likely be fixed by setting the value of the {{{game3}}} parameter to Half-Life 2: Deathmatch.
• The {{{game4}}} parameter is inconsistent with the name defined by the {{lostcoast}} template. This can most likely be fixed by setting the value of the {{{game4}}} parameter to Half-Life 2: Lost Coast.
  If a parameter is consistent but you're still seeing this warning, it may be an issue with the template itself. Please discuss it on the template's talk page.

Entity description

It automatically spawns whenever npc_helicopter spawns and follows the helicopter wherever it goes.