When you situate something, you figure out where it should go or exactly where it is. You might, for example, use a compass to situate the hunting camp you're building on your grandfather's land.
Your brother might decide to situate his drums in a far corner of the basement, where his banging is less likely to disturb the household. A land surveyor might use a GPS or satellite data to situate the boundaries of a particular property. In the 1530's, situate literally meant "to give a site to," from the Medieval Latin situare, "to place or locate," with the Latin root word situs, "place or position."