Indian Space Research Organisation (ISRO) officials deny any diversion of focus is delaying the operationalisation of navigation satellite system.

The three satellite launches will be in addition to the one that India is expected to put into orbit on March 28 evening.

"We will surely be launching two more navigation satellites this year apart from tomorrow's (March 28) launch. At the end of the year we will have six navigation satellites up in the sky out of the constellation of seven such satellites," senior officials of Indian Space Research Organisation (ISRO) said.

According to officials, the seventh and the last one of the Indian Regional Navigation Satellite System (IRNSS) in all probability would go up early part of 2016.

The full navigation services are expected to be offered from mid 2016 onwards, according to the officials.

They said the countdown for Saturday's rocket launch is progressing at a good pace in a smooth manner and all the activities are geared up for the 5.19 PM blast off of the rocket.

The Indian rocket Polar Satellite Launch Vehicle (PSLV-C27) is expected to blast off from Sriharikota rocket port carry the country's fourth navigation satellite IRNSS-1D.

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