Electronic Maps
Many times, these are included in the MDCs discussed above. An officer can receive the call, read the details, and see an exact path on how to get to the call the fastest and safest way possible. While this may be ideal for taking a report of a cold auto burglary, it is not as helpful when someone takes off on foot and you find yourself searching for street signs while chasing someone. Anyone who has ever been in a foot pursuit and not known their exact location when they catch up to the bad guy knows what I'm talking about here. That is one of the worst feelings in law enforcement, the feeling of being alone and not knowing how to ask for help. Don't let yourself get into that position.
Be sure you know the common areas, as well as the not-so-normal routes through the city. Make a point to take a different route to a call every once in a while, and get familiar with the perimeter roads on the outskirts of your city. You can be sure every criminal knows theses roads well, and uses them more than the well-traveled routes.
Many officers tend to think there is an imaginary wall that separates their city from the neighboring communities. Criminals don't think this way, and commonly cross city borders knowing the agencies on the other side probably have no idea what they just did in another jurisdiction. Right after their crime is completed, many suspects head straight for the city borders and skip town. Armed with this knowledge, we as officers should be able to position ourselves to intercept them on their way out of town. This would require knowledge of the routes they normally take, something you can't get from your electronic map or MDC.
Knowing your city streets will also help you set up better perimeters, forecast escape routes, and sneak up to silent calls more effectively. You'll be able to do all of this without the aid of your electronic map. Also, when the server crashes and you suddenly find yourself back to the pencil and paper days of taking calls for service, you won't be completely lost. As stated before, the one sure thing about computers and electronic equipment is that they will have their glitches, normally at the most inopportune times.