How to locate a wireless LAN access point without GPS?

Hi all,

In our company, I found that someone installed a wireless LAN access
point in the office without inform our IT department. I heard that we
can locate the exact location of the access point if I use the wireless
LAN notebook (without GPS) with some software to walk around the floor.
Does anyone know which software can do so? Thanks.

Regards,
Dovelet

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