India's Poseidon adventure begins
Indian Navy Re-Floats Bid For Medium Range Maritime Aircraft
Indian Navy Begins Search For HALE UAVs With Optional Weapons
India’s Navy Picks Its Future Maritime Patrol Aircraft
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Going by these articles, IN's air-based MPA fleet is coming along nicely and would look something like this around 2020:
15 P-8I LR-MPA (8 + 4 options + likely 3 reserves) -> replace TU-142 (blue water operations)
15 MR-MPA (6 + 6 options + likely 3 reserves) -> replace IL-38 (green water operations)
15 Dornier-228 SR-MPA (15 units as of 2002) -> replacement likely (brown water operations)
15?? HALE UAV MPA (12 units + likely 3 reserves) -> support LR/MR operations (blue/green)
15 MALE UAV SR-MPA (12 Searcher II and Heron + 3 reserves?) -> support SR operations (brown)
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Total (including reserves): 45 Manned MPA + 30 UAV MPA
Note: 3 reserves (for attrition) are my estimates based on having one per naval command (WNC, SNC and ENC).
If the above MPA assets are divided equally among the three naval commands, it would look something like this:
Western Naval Command (WNC)
4 (+1 reserve) P-8I LR-MPA
4 (+1 reserve) MR-MPA
4 (+1 reserve) Dornier-228 SR-MPA
4 (+1 reserve) HALE UAV
4 (+1 reserve) MALE UAV
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Total: 20 MPAs + 5 reserves
Southern Naval Command (SNC)
4 (+1 reserve) P-8I LR-MPA
4 (+1 reserve) MR-MPA
4 (+1 reserve) Dornier-228 SR-MPA
4 (+1 reserve) HALE UAV
4 (+1 reserve) MALE UAV
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Total: 20 MPAs + 5 reserves
Eastern Naval Command (ENC)
4 (+1 reserve) P-8I LR-MPA
4 (+1 reserve) MR-MPA
4 (+1 reserve) Dornier-228 SR-MPA
4 (+1 reserve) HALE UAV
4 (+1 reserve) MALE UAV
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Total: 20 MPAs + 5 reserves
With this kind of distribution, each naval command would be able to conduct 24-hours Maritime patrols in the blue, green and brown waters simultaneously for an indefinite period of time. One in air and three aircrafts on rotation per blue, green and brown waters. Plus, one each of HALE and MALE UAV in support.