It is the entire book "Birds of the Indian Subcontinent" by Richard Grimmett, which is the best field guide I've used in India (minus all the stuff at the front). It has some advantages over the book edition, obviously it is easy to carry! It also allows better viewing of both the maps and the illustrations (on the iPad it looks incredible, though I won't carry my iPad into the field). And allows for quick searching.
Yet it seems to be a little glitchy and could use a little polishing. It seems to be missing either maps or illustrations for a few species (some are possible vagrants, others are just plain missing like the Indian peafowl) I would also love to see some work put in on the sounds of birds.
Comparison with similar birds is possible, but cumbersome. You have to know which birds are similar, and you can only view two at a time.
I will look forward to an update of this guide.
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