The satellites used in Indian Navigational System or so called Indian Regional Navigation Satellite System are not polar satellites.Three of them are Geostationary satellites and other four are Geosynchronous satellites.
Polar satellites revolve around the earth in North-South direction, where as these satellites revolve around with the same speed as that of the earth's rotation so that they appear to be fixed on sky for observers on earth. This is exactly what is needed for navigation systems.
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