Garmin has updated the India HUD app and the smaller map with some content moved to sqlite can be found in the ipa.
Code:
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Download using itunes, one doesn't need to have an actual device to create an Apple id without credit card info and download the app. Use 7zip/Winzip/winar etc to extract the map files from the ipa, you'll find them in the Payload\garmin-nav.app\storage-india\.System folder
The main map is less than 1gb, so it can also be used without the accompanying files in some of the older garmin devices.