Everyone either already has or desires a built-in or portable navigational device of some sort. They are even available now on your cell phones. I know some road officers are actually using them on patrol. Now, stop and wait a moment. Yes, they are great but there is a little too much technological short cutting going on here and this is a large safety issue.
First of all, your FTO training and your first few formative years on the streets are the years where you should learn your beat and jurisdiction. Yes, these devices have a place: a transport to another county jail, attending court or training in another city, or helping a lost motorist. But in your early years you must learn your turf, no short cuts.
Your safety and tactical advantages cannot be compromised either. If you become too self-reliant on a GPS, what happens when you are in a pursuit (vehicle or foot) and you find yourself in trouble? Say you need to reach for the microphone to tell dispatch you need help. They ask for your 10-20 (location) and you do not know where you are. This is what I am talking about; you must know your city.
Now the driving safety facts. If you are driving your patrol car and you are looking at a small screen, for example on a cell phone, you are distracting yourself from your mission. That mission is to safely operate a motor vehicle and traverse your beat without drama. There are far too many "cockpit distractions" that cops have to deal with. Radios, audio-visual warning systems, radar, and do not forget the usual distraction—the other motorists!
Far too many cops are dying and countless are getting injured from needless motor vehicle collisions. Notice I said collision, not accident. You can prevent some of these collisions with a little safety added in. If you are propelling yourself down the highway, the last thing you need to be doing is fiddling with your MDT or squinting at a screen. Pay attention; this is your safety here.