Instruction: Answer the given question using the supporting document.

Input:
Question: Does this use a lot of data? City vs Highway, is there a big difference in data usage?
Document: This iRadar performs as expected sending out alerts as often as programed in the accompanying free app downloaded from the iTunes store. You can adjust sensitivity to city or highway settings which is nice as certain false alarms can result from infrared devices in town. It has performed as expected with alerts sounding well in advance of even sighting police either in front or behind me. It is always good to know where speed is being monitored.
Works great I have been traveling a lot and it has saved me! If. Got it for under 90$. .......
Is a great device, but it is too sensitive and disturbing, even so, I recommend it because it is a big help.
Of course, since you're only using this to give you a heads up upon approaching construction zones and notoriously inaccurate redlight and speed monitoring cameras, that's not a big deal ;)
I returned this radar detector because I could not get it to work with my phone. I ended up purchasing the standard Cobra radar detector XRS9370 that does not need a cell phone to operate. So far the new one has saved me a lot of money in tickets.
If you live in a congested city where you never reach that speed no problem.The unit shuts off constantly for no reason...you just hear "power off" for no reason. Perhaps overheating...then you have to turn it off and back on.If you are moving fast the map function is useless as you can't zoom out, you are moving too fast for the map to keep up.Overall they have a good ideal but the execution sucks. Buyer beware....
Don't misunderstand the fact that you still are able to use it without a smartphone but it is much more informative with a phone synced.
Great. Works perfectly. Use with iPad  Has more features than expected. I highly recommend this product. You won't be sorry.
Its a good radar for the price, just wish it would remember the false alert areas. Software is easy to use and I'm glad I bought it.
This is a fantastic device. You can use an old cell phone and load the app from the Play Store. Then mount the phone on the windshield of the bike. Now you have heads up display for speed, radar detection, and GPS.
Answer: I have unlimited Data with my Verizon plan, but honestly the greatest amount of Data used by cell-phone maps is the map itself. Since I cannot even get the local map to pull up with GPS signal alone, unless I have my data connection turned on, I assume that my Android-based phone waits and downloads the map information through Google-maps live, on the fly, and only stores a small amount of whatever is near me through the route calculated to my stated destination. I actually think it too bad the user does not have the Option with Android to retain all map data once it is downloaded, perhaps up to a certain volume (200MB maybe?) and allow the live feed to simply 'correct' whatever is newer as it comes in. I would seldom miss the live Traffic info that colors the route green-yellow-red on my google navigation. When in the Cobra-App, it is just like having your Navigator in MAP mode (no routing or navigation shown).The amount of extra data to download the live user-reported risk areas from Cobra would be insignificant next to that. So if you are already using your phone for navigation, you should have 'about' the same level of data usage, regardless.I will say that I have found it particularly useful having a live download of stationary camera locations. Drivers have to be extra-vigilant around red-light intersections and speed-watches, since camera-tickets are notoriously inaccurate and occasionally found programmed to maximize the profit of the company getting a kick-back based on how many tickets are generated, rather than truly penalizing only the reckless drivers.On having a Radar Detector in every car: My state puts up construction signs with radar onboard, which results in an audible and flashing alert to watch carefully that you are at the correct speed for every Construction zone. You REALLY don't want to accidentally be cruising into one of those at 65 mph.