You do not need to enable this. It's trying to get you to turn on Wi-Fi in order to track you for ads and location based services. They claim they are improving your location accuracy, but in terms of how accurate you really need to be for driving /Navigation... it's not going to help to automatically be picked up by forty Wi-Fi networks along your trip. It allows more sophisticated marketing and burns up more battery.
Personally, I run maps almost totally offline a great deal. This saves a lot of data use. Start off on a Wi-Fi network somewhere. Search for a location... your destination. Click on the name of the city or item when it appears. Under the map... to the left of the blue car icon. Then click Save Map to Use Offline.. (right under the street view photo ). Adjust the zone of the map to be saved... as large as possible before you get a message that it's TOO large. Name the map and save... all on Wi-Fi. Now hit the blue car icon for directions... then hit Navigation. You will get the voice directions initiated. Now leave Wi-Fi and drive. Turn off data! You've got the map and the route in memory and Navigation active. Drive... obviously your GPS /location needs to be on. You get voice and map directions for your full trip without using any data on your plan. Been doing this for years. Also good if you're out in woods or dead zones.