What are detection angles used for?

 

I looked on here and a few other areas and haven't been able to find a good answer to what a "Detection Angle" is and why you would need to change it. Any help?

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Charley - Nuvi 350 - Bel STI Driver - Cobra 29 w/ wilson 1000 - AIM: asianfire -

Its used for the laser

Its used for the laser sensor

Laser sensor? I don't see

Laser sensor? I don't see any laser sensor on it and if there is, what is that used for?

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Charley - Nuvi 350 - Bel STI Driver - Cobra 29 w/ wilson 1000 - AIM: asianfire -