This is one of the many reasons I have become resistant to using a GPS, at least in my primary response area. If I am working there, I better know the streets, or at least have a decent map, and a partner who can read it. I feel like if I were sent to "South Independence", and I saw an independence on the north and south sides of town, I would head south. Mapreading is such an important skill, but we are seeing less and less of it in new employees.
Our mapbooks don't show the city as a whole. Each page shows a small square mile to three square mile, so you can get around subdivisions and such. But if you are on one side of town, and try to get to the OTHER side of town, it is more trouble than it's worth.
First, you find where you are. That's page E3. Then you travel west on that road, and you reach the end of the map. The edge of the page tells you to please go to page A5. The road you're on ends up and the upper right corner of that map. You go to R1, to see where the corner continues, and immediately have to hook over to D7. Finally, you get to the map page D13, where you finally have your destination located.
I also keep a normal city map on me, just to get to the general location in case the GPS's go down, but the official Department policy is "You will use the mapbook, and we do not support the use of GPS devices or supplemental maps." It's all CYA on their part.
When used properly, the GPS will get you to the general location every time. So long as you enter the address right, it will get you within a mile or so. Then, if you can't find it, the map book is great. As long as you are within the grid, it is incredibly helpful to get around all the little suburb areas.
Yes, it's great to say "know your area." But my area is so complex and webbed with an incredible amount of tiny side roads and such, it's next to impossible to memorize them all. And if you're knew to the area, you need something to help. Map reading is an essential skill, but a GPS is a great shortcut.