Where would those radars be located to cover entire Indian Ocean?No need to look for a crash, when the planes whole trip can be seen. That is what RADAR does.
So there is no need to look into the ocean, for a pin in a hay stack, if its there follow the track from the system.
No total coverage you say? What part of the earth will GPS not work?
And why? @Astro14 already explained that there is not tactical or strategic need for such expensive devices at that part of the world.
North Atlantic is far more strategically important, but there is no complete radar coverage. Astro can talk more about it from pilots perspective as he did European routes.
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