High German mobile navigation APP version of the interface?

Navigation map phone Baidu High German

High German navigation software Mobile APP version of the interface is what achieved? I know high German web version, Baidu mobile navigation APP, Baidu Mobile Map APP, Baidu web version of the map, such as are used in the picture display. But the study of high moral navigation phone APP interface in the form of a picture display like that is what the technology to achieve it?<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
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Personally think is a graphical drawing out, with the underlying graphics library written in C.
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cited a floor birdsaction reply:

personally think is a graphical drawing out, with the underlying graphics library written in C.

I actually said was online navigation, navigation maps and Baidu now have high moral free download, after download navigation will find online and offline navigation, offline navigation requirements need to download the offline package, I not required to know the package off the map interface is how to achieve, I just want to know is when online loading map is what is displayed? I think it is nothing more than two, one is to get the picture from the server, and the other to get geographical data from the server to the client, the client and then to draw the map and display information based on geographic data. I do not know if the analysis is wrong, I do not know there is no other way.
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Navigation data is retrieved from the server, and then draw a map based on client data. Personally feel that this situation is more common.
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If the picture obtained from the server, traffic will be very large.
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references, 4th Floor birdsaction reply:

images retrieved from the server if the traffic will be very large.

little calculated web version of each picture before 3K, a total of 28 within the viewable area map, that is 84K, if it is mobile version should be smaller.