If your informants don’t know where they’re at, ask them to read the nearest sign, even if it’s "Three year unlimited warranty!" Maybe it’ll ring a bell for you. Ask them if they have OnStar or some other manner of GPS tracking. If they’re ambulatory or can drive, get them to go somewhere that is recognizable to station personnel. With most calls, it isn’t that imperative that the officers respond right to where the problem is; oftentimes, it’s preferable not to.
There are also times when the information provided is too simplistic. While descending on a suspect who was hellbent on taking out his girlfriend and her family with an AK-47, we were advised that the suspect was "on the right side of the girlfriend’s house." Without a "You Are Here" marker painted on the street, we couldn't tell if it was the right side when facing the house or the right side when looking out of it. In these cases, it is important that field personnel ask appropriate clarifying questions.
And what can you do if you are four blocks into a foot pursuit and find yourself lost? You could run the license plate of a parked car in hopes that the car is registered to the same address. Or you can ask the desk to look up the address of the movie theater you see a block away to the east.
Once you are on scene and have to coordinate assistance, you want them there as soon as possible. Whether you use radios or cell phones, telling them to make the third right can be tricky when parallel streets are intermingled with paved and unpaved roads or alleys. Be specific. Are they to make a right turn on the third street east of the intersection, the third access road, or the third right just past the alley?
Avoid putting people in possible crossfire situations. If you’ve got people detained at gunpoint with barrels pointing due east, you will probably want units to approach from the west.