Status update:
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Used the code jremington gave me.
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I have tried going outside with perfect clear view of the sky.
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Fiddle around with RX and TX pins.
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Also, i tried changing from 3.3V to 5.0V.
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Made sure the baud rate is 9600 as MAS3 pointed out.
All that with same results, nothing on the Serial Monitor. However, i did find out that Serial class works and Serial1 class doesn't... Maybe a bug or the information is outdated on Leonardo's page?