The Indian Navy is organized into eight districts, corps, and commands.
At the top of the pyramid is the Fleet Admiral, who reports to the Minister of Defence. The current Fleet Admiral is Kashiram Paswan, who replaced Sanjay Das in early 1928.
Reporting to Admiral Paswan are eight senior officers, representing four geographic commands and four organizational commands. This does make the Indian Navy somewhat top heavy in theory.
Administrative Command is exactly that, an administrative body that deals with human resources, military law, training, and so forth. This Command is based in Madras, and is typically filled by a Rear-Admiral.
Capital Projects Command is responsible for acquiring, maintaining, and disposing of assets. This can include buildings, base facilities, warships, ordnance, and aircraft. With four major facilities - at Mumbai, Madras, Sittwe, and Trincomalee, plus smaller depots and bases elsewhere - it's generally necessary to fill the post with a Vice-Admiral.
Naval Aviation Command operates the fleet's aircraft and provides the groundcrews necessary to support them. This has been the case since the very first aircraft was acquired by the navy - though both plane and pilot were seconded from the Army Aviation Corps, they were administratively Navy. For its part, the Army would rather see the junior service with its own aircraft, pilots, and doctrine than have to actually get involved with "wet" operations. Since the Raj agrees, there's no real debate on the subject. The Naval Aviation Command at this time is commanded by a Brigadier - Army ranks are retained for this command.
Naval Infantry Corps at this time consists of a regiment-sized formation, though this is largely an administrative convenience. In practice, the Corps is primarily utilized as on-ship security, though they may also be put ashore for various duties if appropriate. The Corps does not have an amphibious assault capacity at this time, much to its dismay - the use of two Army regiments to take As Salif was greatly lamented within Naval Infantry circles. NIC is also commanded by a brigadier; again, army ranks apply here.
Western, Central, and Eastern Maritime Districts are all senior-level commands and have major combatants attached to their order of battle. All three are commanded by a Vice-Admiral, typically supplemented by a Rear-Admiral.
The Southern Maritime District is a junior command, with at most a cruiser attached to its order of battle. Consequently, the post is usually held by a Rear-Admiral or even Commodore.
The As Salif Squadron is an extension of the Western Maritime District, but is often reported separately due to the geographic difference.
Recent thinking has suggest that the Maritime Districts are no longer a useful way of dividing command authorities. Consideration is being given to breaking up the Navy along squadron lines instead. In many cases the same ships would be present in a certain area, but there would be less bureaucracy involved in transferring them between theatres.